Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b08f7520153d10…

MALICIOUS

PDF

40.7 KB Created: 2020-08-03 12:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f48f52fe8cbb9b587d459e8e8954dcf SHA-1: 44f13f201448aa46365872ca1366c3cb3e4bda8b SHA-256: 02b08f7520153d1038a4805b3adf215e9c0ef2ec8251efa5afe7552bfb879660
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL designed to serve malicious content. The presence of a large number of external PDF links, many of which are benign, suggests a link farm or SEO poisoning tactic to disguise the malicious redirect. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=stream+processing+with+apache+flink+o+reilly+pdf+download
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://files.madewithloverldesigns.com/uploads/1/3/0/7/130739517/sinarosum_sezipajuzox_kimekazitubus.pdf
    • http://files.the1diamondlifestyle.com/uploads/1/3/1/4/131453695/7052362.pdf
    • http://files.kazmetixartistry.com/uploads/1/3/0/8/130873855/8560475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/sunikosoxazajisanaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/46969477246.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5398/files/64029634825.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/muzuxewote.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/84227853663.pdf
    • https://cdn.shopify.com/s/files/1/0433/7054/5308/files/goguxekirug.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/super_mario_nes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/zilotesobopejanaxaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/ubuntu_12._04_source._list.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/kuxonuxilasoverovawol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/vexifiwokafugava.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/nintendo_ds_emulator_android.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_off00005dcb.bin
47318b37646f05043e31e8c0cd3a5f91de1691a2dbdc09d501a599d899c97cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 5932 bytes
font_01_sfnt_off000071e6.bin
e8df5226f23e3b3a6d7d432c5e3663f6dd9814c9ecd903fab6fcea02ed02d2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E6 10368 bytes

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