Malicious PDF — malware analysis report

Static analysis result for SHA-256 8872c096a4caa5bd…

MALICIOUS

PDF

43.8 KB Created: 2020-07-07 12:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5212b67e92cc696dee37f0bce9204a32 SHA-1: e406458c9d96cc9eb59ec3b01560c6f3c32c3819 SHA-256: 8872c096a4caa5bd66d647108c0892734a2b4379cde645a19d8108e997d88705
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and appear to be part of a link farm. One URL, https://ttraff.cc/wb?keyword=optical%20fiber%20communication%20tutorial%20pdf#optical+fiber+communication+tutorial+pdf, is flagged as a malicious redirector. The document body, though obfuscated, contains keywords related to the links, suggesting a lure to drive traffic to malicious or spam 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=optical%20fiber%20communication%20tutorial%20pdf#optical+fiber+communication+tutorial+pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://files.gulnurozdaglar.com/uploads/1/3/2/3/132302913/38e83.pdf
    • http://files.middleclassempowermentzone.org/uploads/1/3/1/3/131383018/felixogotolako-xawavorukate-wizijoboro.pdf
    • http://files.antoniodavidsinopoli.com/uploads/1/3/0/8/130873907/4090271.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://files.threeaineconsultancy.com/uploads/1/3/1/0/131070125/587526f65.pdf
    • http://files.alissaellisphd.com/uploads/1/3/1/4/131452827/844207.pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://files.mnjeweler.com/uploads/1/3/1/4/131437740/fomurogoxufirofaliz.pdf
    • http://files.projectufo.org/uploads/1/3/0/7/130739381/4877757.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zujaxisujuxa.files.wordpress.com/2020/07/36263466942.pdf
    • https://bazolexadole.files.wordpress.com/2020/06/33217740184.pdf
    • https://sifobane.files.wordpress.com/2020/06/10861886049.pdf
    • https://muzinag.files.wordpress.com/2020/06/95692377842.pdf
    • https://tixobumot.files.wordpress.com/2020/06/4148621935.pdf
    • https://xebamobakur757036922.files.wordpress.com/2020/06/20518947977.pdf
    • https://puzotineper.files.wordpress.com/2020/06/69093457581.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_off00006dae.bin
79a1592be311724733fafabe9b2303f4d192a82c05c7b7d6167297a5d4602470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAE 5172 bytes
font_01_sfnt_off00007f1a.bin
51a78a57b71b5ef2262f50f4146e4a58b9fe1058452d601976497198fa21e08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 10240 bytes

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