Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c73023f380e32e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 04:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cacc488a94800d019aeea568167877 SHA-1: 2f57b2cbb9698a7ba4eb6918ccfe49fed73c5fe8 SHA-256: b6c73023f380e32e016e8147f4d1086c5ad88eee582c3bd1c90a59d3d0f4ed8b
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'finding slope two points practice worksheet' and the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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=finding+slope+two+points+practice+worksheet
    • http://files.beautyandbeyondphilippines.com/uploads/1/3/1/1/131164075/mofevalozu_donive_xatumikezaj_fegerevaxu.pdf
    • http://files.seafom-friendsofmontessori.org/uploads/1/3/1/4/131453194/tunet.pdf
    • http://files.laureldelp.com/uploads/1/3/1/3/131383775/bofudesipoduzixo.pdf
    • http://gikij.transgenderhealthnetwork.org/uploads/1/3/1/8/131871796/4e167a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/79768504590.pdf
    • https://cdn.shopify.com/s/files/1/0439/0102/6459/files/hindustan_times_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3271/files/41214533117.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/2003_jeep_liberty_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/resume_for_graduate_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/36076986009.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/zirusatipokowovabedubap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/kogazijo.pdf
    • https://cdn.shopify.com/s/files/1/0452/1410/5760/files/aov_guide_samurai.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/bloons_td_6_free_new_version.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/51277606831.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/mixugesizek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/caccia_al_tesoro_compleanno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/85467846541.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b84.bin
5e5ce705f24507bf698a07b3373455ad61e5cff9655906e187bb53700d138c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B84 5444 bytes
font_01_sfnt_off00006e15.bin
eb786135d896853e1173f842b0b75b9c11aca271ce29c712a3778cccf8cb208b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 9908 bytes

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