Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ed8f71c46e67c0…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 19:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80f093ad71797056362e222e87b08c58 SHA-1: abe1ab4f158a09874a9aacd8aed468fdd5540d54 SHA-256: 10ed8f71c46e67c08d6dde9304ab3b66d83e682481e49438a80a0f68f4909bf3
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm, and one specifically to a known malicious redirector. The document body, though partially garbled, contains text related to 'pdf audio reader software free download' and includes the malicious URL, suggesting a lure for users to download potentially harmful software. The ML classifier also strongly indicated maliciousness.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.ru/pify?keyword=pdf+audio+reader+software+free+download
    • http://futifil.stmarysmidleton.com/uploads/1/3/1/3/131398455/nopigetogirowumar.pdf
    • http://files.rhymeasylum.com/uploads/1/3/1/4/131437307/3691130fa749.pdf
    • http://files.deborahjonesdesign.com/uploads/1/3/2/3/132302787/mibamiwusurotameleg.pdf
    • http://files.whypetaeuthanizes.com/uploads/1/3/0/8/130814769/4941356.pdf
    • http://files.phusikosskincare.com/uploads/1/3/0/8/130814169/8805091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/29036713887.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/93400782882.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/99414628532.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/konirizutir.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/management_ricky_griffin_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/boverkets_byggregler_bbr.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/38564640461.pdf
    • https://cdn.shopify.com/s/files/1/0429/4970/5881/files/24639625371.pdf
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/kofotalabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/noxip.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/cardiopathie_dilate.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/problem_solving_with_c_9th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/kojazatogax.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_off00006768.bin
9a96829fb90587a0976e1751859c9409701c0af2d2bbc9c6652407cfcbca5cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6768 4992 bytes
font_01_sfnt_off00007882.bin
02c03c464074ac9d8ca8128a7e63beccc9aa516aa5b698e4189db0d4d362aab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7882 10068 bytes

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