Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d49f49bf7b14590…

MALICIOUS

PDF

48.7 KB Created: 2020-08-24 15:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 588807b67a0f5835b7216a27d486cde0 SHA-1: 211386b26a5f347a2d85e4c8bf31c3c722a01b48 SHA-256: 5d49f49bf7b14590c3e60fb4a12c2c592bf23a79fc8f23b765148309e958f50d
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'map minecraft asleep 3' download. The presence of a download button heuristic further supports the phishing pretext. No scripts were extracted, but the primary attack vector is the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=map+minecraft+asleep+3
    • http://nobunepe.fluidfitperformancetraining.com/uploads/1/3/1/1/131164250/9cd8b392710.pdf
    • http://files.lisamargaroli.com/uploads/1/3/1/3/131381679/zazuvijirifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/fefatozeravirujibokux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/61149659229.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1794/files/nofajenejarofebudirug.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/sufotebafalimabiwemivugu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/child_care_leave_application.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/answer_key_neet_2018_code_ww.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/rekolatawale.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/49600959226.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/biomass_power_plant_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/xuleworove.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_off0000811d.bin
3724ae52c667cc42b46d2bcb1af331985917db27e5d7868648a7f17bc5413e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5328 bytes
font_01_sfnt_off00009327.bin
d90d85c5359addc35e4de754dffccb20c21d2f7f27235095cfce5fbe8bcc65d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9327 10172 bytes