Malicious PDF — malware analysis report

Static analysis result for SHA-256 754b40143d84c2ea…

MALICIOUS

PDF

44.8 KB Created: 2020-08-14 02:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8bf34ff79e7bec40e15f2fa77ff47f SHA-1: 4785185c78a54d33267aa231a1a5a3561b68413c SHA-256: 754b40143d84c2eacc7e7e7a77110ebe811d93ebe0686f5cd1e198c113c50f7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of numerous PDF files hosted on Shopify and other domains, with one primary link pointing to a known malicious redirector. This suggests the document is part of an SEO poisoning or link farm attack designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=organic+bamboo+sheets+australia
    • http://files.barnontheweb.com/uploads/1/3/2/3/132303209/c6c900fbf902c31.pdf
    • http://files.celtick9.ca/uploads/1/3/1/4/131452733/3984274.pdf
    • http://files.koboxingusa.com/uploads/1/3/1/4/131406817/zibaxi-kavakep-piwar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/77923328519.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1509/files/73659971458.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/rewemugemiwegifel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/representation_theory_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/86098402631.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/neumonia_unam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/22357510609.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/kemixurixipifipojozosam.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/tabafojevelozit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/nowomixozofazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/44801906245.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/guide_de_conversation_franais_allemand.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fd.bin
7ea143ce0fe045b14d15d46bb8b8bb96f610a09db908a432a74bd9e99dc72eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 5380 bytes
font_01_sfnt_off00007b11.bin
d110112761ccf3dc1a85c640b3b075baca12675fe7209b5f4de1d2117b53dcc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 13752 bytes