Malicious PDF — malware analysis report

Static analysis result for SHA-256 e870d984c8c26927…

MALICIOUS

PDF

50.3 KB Created: 2020-08-08 03:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca05b5d41feb6832bbe1b2f2a7a221b SHA-1: 3b6d003937f4150f8eef3183daddc14977b2ccde SHA-256: e870d984c8c26927fc9ad80e609143f15cf9156b65e7e83082d61ca3a3bb6aef
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

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 the string 'meiosis diagram pdf' and the malicious URL, suggesting a lure. The presence of many external PDF links, some hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. No scripts were extracted from this sample.

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.cc/pify?keyword=meiosis+diagram+pdf
    • http://files.kippysfarm.com/uploads/1/3/0/8/130874110/katifemutomev.pdf
    • http://files.jbsgolf.com/uploads/1/3/1/3/131384340/1edd49a0dfd.pdf
    • http://files.earthspirithearth.com/uploads/1/3/1/8/131856545/7004421da.pdf
    • http://files.imcansw.org/uploads/1/3/1/3/131380258/sezisizomow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/3658187181.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/xipuxeta.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/ririziselora.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/53334098203.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/pupolojedotilitesuxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/5967278590.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/vitavopexabufopuravumov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/lonejurodoguti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/33121442670.pdf
    • https://cdn.shopify.com/s/files/1/0438/3598/1974/files/truyn_c_tch_grim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/79926132271.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f9.bin
0d1c6e0adf7b91d64b6d67482325f17114a017a62aaecbfa1a35d3f318e27ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F9 4936 bytes
font_01_sfnt_off000081cd.bin
9a5ee9e76ca806b0369507210a93c066387ed7e65ffebfd2d3808b448ea08ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x81CD 14492 bytes
font_02_sfnt_off0000ae4e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 4324 bytes