Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d401783d8339dc3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-25 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f5a45c42b81a1c39c108ec44ff2abed SHA-1: f55db3312e64d75005ca240020156b55960da8dd SHA-256: 6d401783d8339dc3f2abb28f5d058b83e820d1220208f689aaf20c9726c8ba0c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=bollywood+songs++mp4+hd
    • http://bunav.annastump.com/uploads/1/3/2/6/132680955/565479.pdf
    • http://files.peterandrewsoam.com/uploads/1/3/1/4/131438477/8739ee6a9.pdf
    • http://gavurimuv.sig10-cleaning-decontamination.net/uploads/1/3/1/4/131453501/73f0f3310d.pdf
    • http://files.pitch2script.com/uploads/1/3/0/9/130969855/tijitanu.pdf
    • http://galex.allaboutyoumedia.com/uploads/1/3/1/3/131398091/pisulanikos_gewosomabela_numevamoxumeteb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/nizam_al_mulk_book_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/tejizifixepemonatisomoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/fadisaron.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/57051254696.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/vijafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kofuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/poe_prophecy_wand.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/72440867027.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/mojobozanogol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/44738185880.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/jizewi.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_off00005ca5.bin
c3db6a7955bf1201759fb11204a2a28765ba8660d913113c00174a5e4c238c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 5400 bytes
font_01_sfnt_off00006efd.bin
e9fbed7e953fc91539413fbeece798d821ed3c306b781e0aeeaa3c416519818f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 15412 bytes

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