Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7433cdf492e5a1c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a85bbd2fb38c3816bda0d18d31771a1 SHA-1: 31fa952816a0968ff011e2ff41e07a8f4119e6ab SHA-256: b7433cdf492e5a1c52ae098b7107ba40614d2a2eb26a017a0e1061206ad6ea60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to 'graphic design basics tutorial pdf' and the URL that triggered the malicious redirector heuristic. This suggests a lure to entice users to click through to malicious infrastructure.

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=graphic+design+basics+tutorial+pdf
    • http://files.hivehoops.com/uploads/1/3/2/7/132740488/wozefimo.pdf
    • http://fuguge.maggiezlatanova.com/uploads/1/3/0/7/130776445/7605901.pdf
    • http://files.writingandrhetoricmke.com/uploads/1/3/2/6/132682848/paboxaparasidibij.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/kaxirenit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/the_princess_bride_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/31977629591.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/27582272489.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/vezugavusoperewo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/6396059885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lexopiwalosadatijasaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/74143010370.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/bls_2020_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/14227740406.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/58388666039.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/71633204575.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/41382565641.pdf
    • https://cdn.shopify.com/s/files/1/0436/7073/2950/files/gubelixiluxopenug.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eff.bin
4b5a06db8d091920e7ce54deea5e09bb728d50f90ac0a78c9af9622c821331dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFF 5588 bytes
font_01_sfnt_off000081f5.bin
a219df6704d231a2d41dfde626d0d710437f4c3e7a711351c4481dfc074f62a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F5 10536 bytes

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