Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de2c4a9d5d5cac7…

MALICIOUS

PDF

52.7 KB Created: 2020-08-10 05:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01bdf843571bd13b56ef88a0cd2c666d SHA-1: 7b5c626bb5fbda804fdf3ffc9f555be925271812 SHA-256: 6de2c4a9d5d5cac7241b7712432bf9ce3aea7523cb283564334308ee75cd2c81
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a job offer acceptance letter, aiming to lure users to a potentially harmful website. The document body itself contains the malicious URL and numerous other URLs pointing to PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier 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.ru/pify?keyword=simple+job+offer+acceptance+letter+sample+pdf
    • http://files.brrclub.com/uploads/1/3/2/8/132815343/9924451.pdf
    • http://files.voodoodollbookblog.com/uploads/1/3/1/4/131438809/434e8b94d6147.pdf
    • http://files.heartofthewest.org/uploads/1/3/1/6/131606094/wemug.pdf
    • http://files.gingersnapsapparel.com/uploads/1/3/1/4/131437513/kepozakevivowepipef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumatuzonew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/18602380084.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/11233142811.pdf
    • https://cdn.shopify.com/s/files/1/0447/9657/5904/files/heart_circulatory_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/bodataweju.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/mujoduvitalarojoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0439/2157/2008/files/brzezinski_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/3229789845.pdf
    • https://cdn.shopify.com/s/files/1/0440/3517/8661/files/gimumafobixakoxopoki.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a1ee.bin
a10dc2187cfbf7805e92f7db8b3920e5ed491820acebd253f8899eb6e493f349		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA1EE 20160 bytes
font_00_sfnt_off00006b53.bin
e01382f54ef59c127bd19b957cc9941ddfdb9653ced56e45c3554e97ced58d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 5620 bytes
font_01_sfnt_off00007e4f.bin
ceb285fdb18e8be37eb72a909601465348989555d3367c6b4a2d3ad13f28548c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4F 10328 bytes

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