Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1ba94adcca02e2…

MALICIOUS

PDF

39.8 KB Created: 2020-08-03 03:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d13040100f9b022459649618992058f SHA-1: 2d5cd2d3f8e36f15a45820222eb352a41f724f17 SHA-256: 7c1ba94adcca02e25961e7cfbcaa85782991de2032536de790fcf0496934c468
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a redirector service. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a URL that appears to be part of the link farm.

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=list+of+punctuation+marks
    • http://files.stoprethinkspeak.org/uploads/1/3/0/8/130873921/wulaziwed_katitakivin_midesamopusol.pdf
    • http://files.glencoeflorist.co.uk/uploads/1/3/1/4/131483128/jizomupopiwo_tujovaw.pdf
    • http://files.mmac.org/uploads/1/3/1/8/131856907/tifajesusi_nemal_surolinaxarefef.pdf
    • http://files.marshallglassgc.com/uploads/1/3/2/6/132681779/5567940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/stiff_leg_dumbbell_deadlift.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/juxulabikobekirorimisijuv.pdf
    • https://cdn.shopify.com/s/files/1/0438/8444/5864/files/banowimegaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/kodatiwuruk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/29595410368.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/26233199306.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/gabuwej.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/dekogobapapegisepoja.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/sosonukafaroteb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/davosefelibawu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/20555958362.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/50421861758.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/23091167038.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e23.bin
ce2c9c592039554459b5ddc0e8e1d29ab735bb8b44e3b1bc8650086af65b3970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E23 5136 bytes
font_01_sfnt_off00006f8e.bin
c08f9a5633220fa3be0f19b1f37f58c1b07a5c8848d04f3f961a4eccb0152ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 10120 bytes

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