Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffb899a82c0cc0e…

MALICIOUS

PDF

41.6 KB Created: 2020-07-10 11:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b88c713c1190948b1e1f385ed318bda2 SHA-1: 3ac2dd0ac0f97a7e948cd90560c4c3163077e858 SHA-256: bffb899a82c0cc0ecdf66b17728373fb4347b251b0d90553566c39155d14dcad
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. The PDF_SEO_LINK_FARM heuristic indicates a link farm structure, with many links pointing to various PDF files hosted on different domains. One of the primary links, https://ttraff.com/wb?keyword=eto%20sterilization%20process%20pdf, is identified as a malicious redirector. The document body, though partially obfuscated, contains similar URLs, reinforcing the malicious intent.

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.com/wb?keyword=eto%20sterilization%20process%20pdf In PDF document text
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdfIn PDF document text
    • http://files.musicmaniowa.com/uploads/1/3/0/8/130874350/7753537.pdfIn PDF document text
    • http://files.leoslionsden.com/uploads/1/3/0/7/130738534/5a9a0b.pdfIn PDF document text
    • http://files.stator-creative.com/uploads/1/3/0/9/130969404/3156643.pdfIn PDF document text
    • http://files.carsontidwell.com/uploads/1/3/1/4/131438249/mumiv.pdfIn PDF document text
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdfIn PDF document text
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdfIn PDF document text
    • http://files.momtomomsales.net/uploads/1/3/0/7/130775907/babawutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://daxazajebu.files.wordpress.com/2020/07/vesoletomovudetegupiruxi.pdfIn PDF document text
    • https://segemabo.files.wordpress.com/2020/06/navezavebomefixuxububowog.pdfIn PDF document text
    • https://xupapinir.files.wordpress.com/2020/06/xifelilosikojilamizir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 4944 bytes
SHA-256: af6f16bf77b6cf6be36733a553821e914a1ad0c47957473227d959d2c23d9955
font_01_sfnt_off00007697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 10232 bytes
SHA-256: a324b61108cdcc48af4338818689f9335b6194001ea8b3ce83d39dd8bef9202d

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