Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aac3701aa74f9f…

MALICIOUS

PDF

39.2 KB Created: 2020-08-23 00:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57b34e35566842e641203262e2478a1 SHA-1: 5913b37c028adb71129966abb40d0ac173fbbcff SHA-256: 70aac3701aa74f9f3c9893e0112a02d09f81a8f954c51931b3933a7c5be46a9f
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a specific malicious redirector URL, suggesting it is designed to lead users to harmful content. The document body, though partially corrupted, contains the text 'Summer camp counselor interview questions and answers' and the malicious URL, indicating a lure to encourage clicks. The presence of numerous external links, many pointing to Shopify PDFs, suggests a link farm used for SEO manipulation or to obscure the malicious redirector.

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.cc/pify?keyword=summer+camp+counselor+interview+questions+and+answers
    • http://files.becomeyogi.com/uploads/1/3/1/4/131438161/paxetumik-zerodulefivafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/dividing_complex_rational_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/wichita_mountains_climbing_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/google_play_store_apps_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/technological_innovation_resource_allocation_and_growth.pdf
    • https://cdn.shopify.com/s/files/1/0433/7627/9702/files/15394592660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/49740068566.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/cisco_3750-_e_ios.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/tiwatobinolapubepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/holy_grail_rs3.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_off00005c10.bin
ce3a1c0cbb1bb8108ac9783284a8ce73b9d53b69b6b8933346cffca346fb5204
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 5600 bytes
font_01_sfnt_off00006f08.bin
abd79c621cd6a0500dc98192da604b8b77ec2ab88112dbfa5485dc314453c2c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 9736 bytes