Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7721db06a3d1d…

MALICIOUS

PDF

52.2 KB Created: 2020-08-28 12:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d2f2cb158df74d536ca79cb6436da9 SHA-1: 3cb5aac38c07fa80f9d3ceb28e896706a99c6b13 SHA-256: 11c7721db06a3d1d792a6b4641c0560dfbdda5870f024c49fbfd3ce13f1dc756
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing pages.

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.com/pify?keyword=duerr+chipper+678+parts
    • http://tanim.themayecenter.com/uploads/1/3/0/7/130739678/vixezi-kageduwelib-misagaforug-xezajafod.pdf
    • http://files.snowsbendfarm.com/uploads/1/3/2/6/132681694/42f7418.pdf
    • http://files.truthserumhottopics.com/uploads/1/3/1/6/131606619/geseparajiga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/86336103529.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/cardiac_tamponade_journal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/the_three_musketeers_by_alexandre_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/ecg_interpretation_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/anet_a8_3d_printer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/pufebab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/60433120711.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/36405227459.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/wotezunafote.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/bipogidukugosuke.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/heart_disease_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/69941781725.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_off00006858.bin
082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6858 3312 bytes
font_01_sfnt_off00007439.bin
89f06cfac212850402c2a29b7fe3433ef10e923ee110887bb25c01c9ddfe5e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 5416 bytes
font_02_sfnt_off000086a6.bin
ff1f2ce29a8b97480d0b96487b863dc38a9d6a9f5632b206e4ab8cdddc259630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A6 11292 bytes
font_03_sfnt_off0000ad2d.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2D 16092 bytes

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