Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09b8b1d975a0215…

MALICIOUS

PDF

45.6 KB Created: 2020-07-09 20:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 7720a15a2672d13004ca8a65209c5820 SHA-1: 3dee98424f8db69693d1300fd6b6de09f9483caa SHA-256: a09b8b1d975a0215d7c4bf05d8d3bafb4665dd10af8d52d4a89fef3ca9625704
184 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.ru, which is disguised as a worksheet answer key. The document also hosts a large number of links to other PDF files, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of the redirector and link farm strongly suggests a phishing or malware distribution attempt.

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.ru/wb?keyword=chemical%20bonding%20electronegativity%20worksheet%20answers In PDF document text
    • http://files.summitsalesrecruiting.com/uploads/1/3/0/7/130775654/ropebosaledagipesata.pdfIn PDF document text
    • http://files.myskiped.com/uploads/1/3/1/6/131607023/wiwup_pazazenib_rununupiz.pdfIn PDF document text
    • http://files.fcwellnesscompanyltd.com/uploads/1/3/2/6/132695574/5a417ce.pdfIn PDF document text
    • http://files.photographybycj.net/uploads/1/3/1/0/131071191/688174.pdfIn PDF document text
    • http://files.womenscoalitioninternational.org/uploads/1/3/1/8/131871909/1323992.pdfIn PDF document text
    • http://files.focusedlearningsolutions.com/uploads/1/3/1/6/131636990/49d8e9.pdfIn PDF document text
    • http://files.singaporepoetryslam.com/uploads/1/3/1/8/131871467/5060274.pdfIn PDF document text
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://keganuforuro.files.wordpress.com/2020/06/18503485519.pdfIn PDF document text
    • https://dupegon.files.wordpress.com/2020/06/12966360947.pdfIn PDF document text
    • https://zasajeloso685135112.files.wordpress.com/2020/07/89692294651.pdfIn PDF document text
    • https://texiduga.files.wordpress.com/2020/06/18153677156.pdfIn PDF document text
    • https://tanudatekaj.files.wordpress.com/2020/06/nopijudababumimelivuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bixebor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikidewutuxazumal.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_off00007359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 5624 bytes
SHA-256: 1b4163814be361f5fc0be6f31b1dbd4e9549881fc215079220d8403148db3779
font_01_sfnt_off0000865f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 10260 bytes
SHA-256: 7a0046018cebb0c04d87dfb0fd68763219c65c74a69499d428db54901bf1c48c

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