Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a62876ab9819df5…

MALICIOUS

PDF

47.6 KB Created: 2020-08-21 19:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14befc98a6f07eb5c626c5fc1a88f4ce SHA-1: bd7aa751c497daef21d9240bcc5cef018ea8246a SHA-256: 1a62876ab9819df5f2a919eb251bb60622371619eca8630acac49a76c4460a2e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for 'gb whatsapp gold free', likely a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector link.

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=gb+whatsapp+gold+free
    • http://files.stonecutterswsq.com/uploads/1/3/0/9/130969818/3446600.pdf
    • http://files.medgaming.com/uploads/1/3/0/9/130969548/vanosowukutetaf.pdf
    • http://files.mittminders.com/uploads/1/3/1/6/131606467/3663445.pdf
    • https://cdn.shopify.com/s/files/1/0434/7953/1673/files/anexo_v_simples_nacional_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/53624070774.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/ak_jain_physiology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7624/files/ruteweja.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/hotpoint_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/psychology_objective_questions_and_answers_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/32543295319.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/childrens_cardigan_knitting_patterns_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/bhagavathi_movie_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/wisukitobujixelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/43477796119.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660e.bin
d16d33dda1ca94dc7527595090a48a6192ca94f75cbe7300de808f4ce8ef0f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 5564 bytes
font_01_sfnt_off00007906.bin
c3b0e37bd6caa2dc66a1718879609f2498c972499be470877a7730cf0181b40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7906 10296 bytes
font_02_sfnt_off00009c7c.bin
0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7C 16168 bytes

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