Malicious PDF — malware analysis report

Static analysis result for SHA-256 172f928fe326a231…

MALICIOUS

PDF

47.8 KB Created: 2020-08-08 18:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bedb42a65268ed676da6c2555f5b5984 SHA-1: 3236c8ebb9e10fbd5e64bfdca991c65f846c214c SHA-256: 172f928fe326a2319d26bd58745272bf24a906d87aa1b6f0d6c3c093c6a296d8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text suggesting it is a calendar, likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a key indicator of a phishing or malware distribution attempt.

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=kalnirnay+august+2020+marathi+calendar+pdf
    • http://files.soniawilliamsart.com/uploads/1/3/0/7/130740571/weroteb.pdf
    • http://files.karenrowellmusic.com/uploads/1/3/1/4/131453784/davolasixi.pdf
    • http://files.plantandsoiltreatment.com/uploads/1/3/0/8/130813516/6061385.pdf
    • http://files.thepoppyrocksball.co.uk/uploads/1/3/1/1/131164236/zovaxutikupewerok.pdf
    • http://files.oakmediahouse.com/uploads/1/3/1/4/131437333/jifulededapabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/pdf_auditing_as_an_instrument_for_ensuring_accountability.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/35843710847.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/nerizutupug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/tefamenetaduxipuxetel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/11056424361.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/70600166660.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/apostrophe_s_possessive_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/36521540401.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/fenilaxepuwune.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/lowezegaku.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/value_guide_conveyor_components.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0540/files/dulazerosotavaxoziwowuw.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_off000062da.bin
57ee100cffc662360641824640a298229a6a1a04edca34255ba5c5cec3371d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 5916 bytes
font_01_sfnt_off000076e7.bin
c39d7446aac89c6517d08df23fcfbb64573bfd22f2c6908faaa357abd3b74552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E7 10464 bytes
font_02_sfnt_off00009a6a.bin
125e42d3adf218b3fea289fdf6fd633d609a74440d24b3e9ef000eb4f567e2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6A 6668 bytes

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