Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a35b5e48b1eb3d…

MALICIOUS

PDF

50.2 KB Created: 2020-09-19 22:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155789fe208a03d1fe766c9d6dbf21e0 SHA-1: 18cdaac4567e88b80a32ab74da055122eb1a3ef2 SHA-256: a9a35b5e48b1eb3d565fa7ac6b9d4c6eaba9132ce32d1c275c7d02850d37e7b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or to download further malware. The presence of a link farm further supports this as a method 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.link/wix?keyword=ap+biology+molecular+genetics+activity+%25231+answers
    • http://files.hinghamspeechtherapy.com/uploads/1/3/0/9/130969080/jetetevo-bikagefexiludet-nugineti-guzuguwoto.pdf
    • http://govuvinox.outreachchemistrycloud.com/uploads/1/3/1/4/131437774/7762445.pdf
    • http://files.klamathmosquito.org/uploads/1/3/2/6/132681969/faxemawawusap.pdf
    • http://files.alanmitchellplasterers.com/uploads/1/3/0/8/130814900/xujuno.pdf
    • http://niril.yourangelarmy.com/uploads/1/3/1/3/131380767/88a540e44.pdf
    • https://a34cde10-f09f-4ec7-b87c-9520413e3b17.fil
    • https://a34cde10-f09f-4ec7-b87c-9520413e3b17.filesusr.com/ugd/6f53d7_66543659510f4854a4c276a6b951d1ad.pdf?index=true
    • https://1e954113-7b9a-452f-a252-bd34caf6a98d.filesusr.com/ugd/c844bf_3f6a12a2591f444c8bc8fec51ab9a5d1.pdf?index=true
    • https://26029428-028f-496b-9036-92eacd7e9088.filesusr.com/ugd/ac8c68_47179dae32ce44619dac885bc6b4468a.pdf?index=true
    • https://a99c0b0b-87bf-442f-9663-22a13f36fc29.filesusr.com/ugd/bc79a4_ffbcca0076fa4bef9b4fe61d93a2458e.pdf?index=true
    • https://0db92269-575c-4e20-94b4-f13e2e8aaa41.filesusr.com/ugd/4fea5c_8677c027aad34107aa45b14ce4618e5d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/3d_video_player.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/56596342686.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/walking_dead_season_6_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/88606688184.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085d9.bin
d02e6b5350d9eded37d789279d43b372272109e69735fde1bae9429757401af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D9 5544 bytes
font_01_sfnt_off000098aa.bin
503b160492596634d3299537252b6cd33281efa3b2744d431618579cf5f626a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 10120 bytes

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