Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fbd9e905cf21e2…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 05:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a3eb1cf3b8ae2ab848c21506841f1e SHA-1: 0654bb814547250605d18fe21611fbf7c25fbfce SHA-256: d6fbd9e905cf21e27dadceadc0dbf8914c470c7b80d3873ce96f843401e74c26
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=year+3+maths+arithmetic+test+pdf`. This link is presented within the document body as a lure for a 'Year 3 maths arithmetic test PDF'. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive 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=year+3+maths+arithmetic+test+pdf
    • http://vebowosi.philshomecenter.com/uploads/1/3/0/8/130874431/8248598.pdf
    • http://files.supermargaret.com/uploads/1/3/1/4/131437770/jananedukewuzave.pdf
    • http://files.christinaorfanoudakis.com/uploads/1/3/0/7/130776327/pipulodagefolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/rojilasunaxak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/kivogisulobelezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/48675662386.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/75943897450.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/blockchain_explication.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/30774423008.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/hindu_beliefs_and_practices.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9203/files/zitarebef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/69967284389.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/descriptive_quantitative_research_examples.pdf
    • https://cdn.shopify.com/s/files/1/0443/9500/4070/files/apocrypha_books_of_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/7355405712.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/gezubesonobozamadavoxap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000688c.bin
daa3d451d48bbd64fa86fb31a8e76b8aa50f3f339d5a3407da62583d8a823098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688C 5488 bytes
font_01_sfnt_off00007b0f.bin
7bb17c179b4c2407310b3d22ca6372ccb18c4ff3147fc9e5271172e98072a0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 10044 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.