Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc30f26f7eec3fa7…

MALICIOUS

PDF

54.0 KB Created: 2020-07-14 04:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a69e09624e1601afb4ad8289e8cff615 SHA-1: 2441936e300476a0e6f7b0106ad4dcce7bcf5e1b SHA-256: bc30f26f7eec3fa7f70bb265299243ff1444863ada77617365d23cad98003c13
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=bootstrap+download+pdf+link In PDF document text
    • http://files.rebelliousrheaboutique.shop/uploads/1/3/1/4/131406413/2090860.pdfIn PDF document text
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdfIn PDF document text
    • http://files.tesoltime.com/uploads/1/3/1/4/131406391/1473909.pdfIn PDF document text
    • http://files.julietteyoga.org/uploads/1/3/2/6/132681316/7414463.pdfIn PDF document text
    • http://files.purrkur.com/uploads/1/3/2/3/132303023/561622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/2701286053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6212/3941/files/50438895552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/nisubajanijadaw.pdfIn PDF document text
    • https://dawujokori.files.wordpress.com/2020/06/13710696546.pdfIn PDF document text
    • https://sifuvuviluz.files.wordpress.com/2020/06/wesadidaj.pdfIn PDF document text
    • https://winodav244765842.files.wordpress.com/2020/06/mefuxevunin.pdfIn PDF document text
    • https://pomufoj.files.wordpress.com/2020/06/lunavazesejokejodofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/bisaloretusovebebewexare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/59660927325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/82278819201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/xamiloveradok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/6594562416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61927850068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49816413057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/82376721014.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE8 4912 bytes
SHA-256: a890da263a95ce7d58e174b532c2f6cfe204ba7e0bd1db92a6607983a2bea033
font_01_sfnt_off00009bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB1 14820 bytes
SHA-256: bee3904c7a6888c47e2912bcba082d4cf62325133c8dccc9c5e538f82e67d531