Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dd9b76bc508577…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 10:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6377e1a1189f3348635f03473575b2 SHA-1: 31b8481fc2e3aaf0e115f2ecf485c1ba57eb48e9 SHA-256: 65dd9b76bc5085775f47071c8fe74b83243f943496159635689ebc84e86bd8b9
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=banking+awareness+questions+pdf'. The document body, though heavily obfuscated, contains text suggesting a lure related to banking awareness questions. The presence of multiple external PDF links, many with numeric slugs, indicates a link farm designed to improve search engine ranking for malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=banking+awareness+questions+pdf
    • http://files.freebackgroundphotos.com/uploads/1/3/0/9/130969659/ribuwamagunazu_viwalitom_waninozenowig_gesetekupege.pdf
    • http://files.matthewbaldwin.org/uploads/1/3/1/3/131384383/kodezo_sutogat_xemejuv_kerivog.pdf
    • http://gomozite.kaileegraham.com/uploads/1/3/0/7/130776131/d7933ea324.pdf
    • http://files.abundantlivingpsychologicalandcoachingservices.com/uploads/1/3/1/4/131438111/f6b4e3c787f.pdf
    • http://files.tonamsausage.com/uploads/1/3/2/8/132814967/naxozitumajapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/petijuwoxoloditolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/94176466721.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/38673168169.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/pedrotti_optics_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/85611483704.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/pindah_file_ke_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/kamosuxogibikudefor.pdf
    • https://cdn.shopify.com/s/files/1/0434/4270/0455/files/lesutevoselibev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.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_off00006156.bin
332bebcfc97a36135e8eb6d37f1f18349c91d7e25f5dd63758d221bb5762e21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6156 5508 bytes
font_01_sfnt_off0000743c.bin
e65d52e3fa504a0d5823a6105cd7742c756f3c1f4f6939caddbcb107e7ad1fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 12956 bytes

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