Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c96be3da9bf18…

MALICIOUS

PDF

52.3 KB Created: 2020-08-24 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca14468caca059adac0692cc86bf2d8 SHA-1: 41e153ab730dd0390539422d30ea2a77ed169c12 SHA-256: 0b1c96be3da9bf1839ab6f7f39e238bfbf706c8908eb5cc1907369841741895c
154 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading an Android application, further suggesting a phishing or social engineering attempt. The ML classifier strongly indicates 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=google+hangout+apk
    • http://rotudo.holderdesign.net/uploads/1/3/2/7/132741144/nilite_govupitur_xagavuwo_jepapupar.pdf
    • http://files.surbiton-tolworthhealthcommunity.com/uploads/1/3/1/6/131606789/pogarujedo.pdf
    • http://files.gkcphotography.com/uploads/1/3/1/4/131438741/8698267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/xilapilusalek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/vande_mataram_lyrics_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/wigizizufewagabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/81033411913.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/wotlk_leveling_guide_horde.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/zugigasepapezepaduverir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/ribexajabasiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/suseva.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/76142887381.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/dell_t340_specs.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/ruxitog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/vugozilokiletobovakigaxu.pdf
    • https://cdn.shopify.com/s/files/1/0443/6580/7772/files/amandemen_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/62928494756.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/gudupo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006893.bin
9ce1d61c72545eaf86dc8bee244bd8b7cbb7ca68bff255996c7da51bf12992fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6893 4904 bytes
font_01_sfnt_off0000793d.bin
95459c871f8cf399f238fa6892cdfc5032b5605d9a579849221e3081616c98cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 6840 bytes
font_02_sfnt_off00008bdd.bin
d568d279e32b85f6a5f09d5d5bbcfd0387d9346425bc6d1df67604a34e94d689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDD 10024 bytes
font_03_sfnt_off0000ae6e.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 16168 bytes

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