Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f2aa20fe575ff6…

MALICIOUS

PDF

38.8 KB Created: 2020-08-13 21:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed33c33c99154c7bc51fb5a91890fe57 SHA-1: 6846af4c627fe8d190b1e0c11d07416c8a6dad12 SHA-256: 76f2aa20fe575ff6ffd5b244a5157b4651ec947f8caf69664616a7ecbf7d3b2a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as sheet music, aiming to lure users to a harmful website. The document body and embedded link structures indicate a link farm designed for SEO manipulation, with the primary malicious URL being https://ttraff.com/pify?keyword=someone+you+loved+piano+sheet+music+chorus. 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=someone+you+loved+piano+sheet+music+chorus
    • http://files.oipelmiracorning.com/uploads/1/3/0/8/130814245/lufobuni-migademigij.pdf
    • http://files.anneboring.com/uploads/1/3/1/3/131379980/0216f7b4.pdf
    • http://sepegizi.dwellcenter.org/uploads/1/3/0/8/130874222/3fdb6ce622c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/27800355556.pdf
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/42255334548.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/lexogiduxobedez.pdf
    • https://cdn.shopify.com/s/files/1/0440/0473/7174/files/kegufikakoreleru.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9578/files/58634044281.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/vozivabo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/xulodigukitufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/51354987779.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/52391081896.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/cbse_class_12_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/42849822105.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/38365355201.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bdf.bin
34afa61cb66c4af5956b26ed0078c255ced1ec4471bdbd889cb37d46cb4e1831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BDF 5460 bytes
font_01_sfnt_off00005e3e.bin
c5fa0bc8a45d5aa86aebd79556f2a0ac346d48a02612a95bd3490add3655aa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 9824 bytes
font_02_sfnt_off00007ff4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF4 4324 bytes

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