Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded7f5bad293e87f…

MALICIOUS

PDF

46.8 KB Created: 2020-07-11 19:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1600690ed5d7e51669e9a5094ea5b859 SHA-1: be3520f9a85fff17dc5839608bdae68eed72c1e0 SHA-256: ded7f5bad293e87fa204ebd4069b0bc89987ada92d317474821c928d81945b50
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, and another identified a large farm of external PDF links, suggesting a SEO poisoning or link farm attack. The document body contains a mix of garbled text and URLs, including the primary malicious redirector URL and several other PDF links hosted on various domains.

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/wb?keyword=romantik%20epoche%20merkmale%20pdf
    • http://files.maestrasawyer.com/uploads/1/3/1/4/131406785/8c16840.pdf
    • http://files.thanksamillionimports.com/uploads/1/3/1/6/131606819/xodifuluvukotike.pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.belfastgdp.co.uk/uploads/1/3/1/6/131607930/1581084.pdf
    • http://files.biblesforpakistan.com/uploads/1/3/1/4/131453648/867ecaabaeaae02.pdf
    • https://joxexib916360925.files.wordpress.com/2020/07/voxowewikad.pdf
    • https://dotivuzuku.files.wordpress.com/2020/06/rapitokivakitiramut.pdf
    • https://witujaji.files.wordpress.com/2020/07/72736868090.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45397061855.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/34703382137.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11411440246.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/65376553172.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/dazejaposuriv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.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_off000077e2.bin
c8cb1ecfbbd893fde95dcade13f82fe91d6153be0333818d6d5494bcedeebed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 5076 bytes
font_01_sfnt_off000088ec.bin
f2df00c4d6602987b2196241279f62cf56f9d02d647540d7ab271dbc4d06c01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EC 10868 bytes

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