Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bcc1a6404483b0…

MALICIOUS

PDF

53.0 KB Created: 2020-08-03 05:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49a7cc6b604c030e1ec3a9a19cdea29 SHA-1: 047b2d5eda778b79d741ef4fc0c83a9cd745cd52 SHA-256: 89bcc1a6404483b0012070b4107ecbd98a9ea96f233d02891454c392cf60914e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'army manual dispatch'. The ML classifier strongly indicates maliciousness, and the presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=army+manual+dispatch
    • http://files.ecpmog.com/uploads/1/3/1/0/131070178/nigujulujo_lipebagerefibo.pdf
    • http://files.globalconnectionskenya.org/uploads/1/3/2/8/132814147/fb239.pdf
    • http://magedes.artspark.com/uploads/1/3/0/7/130775403/3df5cea2e.pdf
    • http://files.stellenboschholidayvillas.com/uploads/1/3/1/4/131437091/3754143.pdf
    • http://files.rosanaourens.com/uploads/1/3/1/4/131453574/7de7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/20272415657.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/golozoponepojumot.pdf
    • https://cdn.shopify.com/s/files/1/0438/1065/2317/files/game_of_thrones_english_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/windows6._0-_kb4012598-_x86._msu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6839/1577/files/tensorflow_version_check.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/72901083937.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/xofabuwajedegiveli.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/64138142103.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/54871958886.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files/86630331360.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/bamukenusamasupeze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084ab.bin
ff5e16def0e07a54caf2af90ffd48afe7fdd9aa3f378b4d3150601e4fa468412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 5056 bytes
font_01_sfnt_off0000959d.bin
10284efb638ab1a875269760156c143ef7e2329e2fd08c7b3763dc64b7b9cd95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959D 10228 bytes
font_02_sfnt_off0000b87e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB87E 4324 bytes

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