Malicious PDF — malware analysis report

Static analysis result for SHA-256 680283b4e7813670…

MALICIOUS

PDF

42.7 KB Created: 2020-07-27 05:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9e55fd6c32e3baa0b9124c60ae5f98 SHA-1: 192bd3a65a45564956770398b718dfd29da14c49 SHA-256: 680283b4e7813670790c759180908c48f8055a6807c08954a78ed63308cc8553
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=png+bike+background+hd
    • http://files.launcestonlittleathleticscentre.org/uploads/1/3/1/8/131872238/nofisawej.pdf
    • http://files.everafterprincesspartyevents.com/uploads/1/3/2/6/132695517/wozewobafeden.pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://files.proclean1.net/uploads/1/3/0/7/130776509/1565970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/16743200013.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/gafuxedovatokaxapes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/wupibibaxijedepaxupozabot.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/teruvipuzedezovowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/47021026104.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/41053643113.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/83945787622.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/32543162148.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/pemokizegis.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_off00006254.bin
61f7fa60db75e8bed5a1705baaad44fbd000c6cdcaaeda5692b59014b45f6ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 5000 bytes
font_01_sfnt_off00007329.bin
0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 1728 bytes
font_02_sfnt_off00007bc0.bin
19be17b1fd2ea6d2f3aafeb50afa6f9784c0004262648a31987e8458e41e3729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 9844 bytes

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