Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cd1d671d464d22…

MALICIOUS

PDF

58.0 KB Created: 2020-09-10 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71ab87a57a720ef7ac3bddbd460c9458 SHA-1: 8361eea895430f4ad020c745198a5da5a5849430 SHA-256: 07cd1d671d464d22ed3ab93a398e861703ac234b48158b3657ca7b73ffe48d6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for 'Adobe reader dc 2015'. The presence of multiple PDF links suggests an attempt to create a link farm or direct users to malicious content. The ML classifier strongly indicates maliciousness.

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.club/pify?keyword=adobe+reader+dc+2015
    • http://xudexo.nexuseconomics.org/uploads/1/3/1/6/131636745/pemitigizukaneb.pdf
    • http://files.coonangusranch.com/uploads/1/3/1/8/131856827/fajinura.pdf
    • http://files.embracingwisdom.com/uploads/1/3/1/4/131437889/bewotode_fitakakusoxidal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/f64db8_a2359573f90d45bf80073ffc8a3f0b8b.pdf
    • https://static.usrfiles.com/ugd/197ed4_3bd5e0f9621a4e44a683bf66987ba00e.pdf
    • https://static.usrfiles.com/ugd/b4609a_d829890e7c2c45e285a7c62017a3aed3.pdf
    • https://static.usrfiles.com/ugd/7041e4_8f849d6fc11743859d0b9714178f7b44.pdf
    • https://static.usrfiles.com/ugd/964009_0c2385a15ab042e58867bd1d53bf7968.pdf
    • https://static.usrfiles.com/ugd/4826f5_3b1226a79d46401f9f8edab9ec884d90.pdf
    • https://static.usrfiles.com/ugd/e3c460_edf24b60b0984d1b8051393355d5d7b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_071dbba00ab84b9e86744c2f01ade6c0.pdf
    • https://static.usrfiles.com/ugd/762c1a_dfa5fcb52c38415ab273e45fdff0a804.pdf
    • https://static.usrfiles.com/ugd/c81504_55b63927e7504df38f5f09eb817a2961.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/nirotavometik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/pewutisaxuxem.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/bluestacks_apk_free_for_windows_8.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_off000097f5.bin
3461dc0132b6eb31d44a911c346ffb01e12b2808b365cf925a09adbe5472950d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F5 4856 bytes
font_01_sfnt_off0000a87f.bin
08e1f975f780d91f304116a7ae93c55a41b14ca4dd2c592bd2774e43536710bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87F 10552 bytes
font_02_sfnt_off0000cc9a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 4324 bytes

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