Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f7938027beefe4…

MALICIOUS

PDF

45.8 KB Created: 2020-08-09 18:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c17234b0241745d3440263a78fcde2 SHA-1: 49e3e3358857929cebe49575084a1999ce01884b SHA-256: 87f7938027beefe476d4e627d11c20fe024f0e5213d9425760e7424c8f941275
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a free download for an 'abstract reasoning test'. This suggests a phishing or scam attempt to direct users to malicious infrastructure. The presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

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.com/pify?keyword=abstract+reasoning+test+pdf+download
    • http://files.buttercreamlane.com/uploads/1/3/1/3/131384656/mejujofamobab-sapidowegidi.pdf
    • http://files.southerntaxis.co.nz/uploads/1/3/1/4/131406258/482ecd7.pdf
    • http://files.lrcommunitydevelopers.org/uploads/1/3/0/7/130740090/kipozuwepokatevazab.pdf
    • http://files.sheroamswild.com/uploads/1/3/1/4/131438389/4677316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6304/0413/files/7319177757.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/ruwowuxovikunorope.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/xagisidemuwiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4340/files/early_childhood_development.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/morphemes_psychology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zabaravoxetifup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/48535954641.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/19012691128.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/paper_cutting_book_contemporary_artists_timeless_craft.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/9782805016.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/65650499876.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/tubow.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_off00007535.bin
79eccfead85eb166b2acd66a00c61cca5575e1faad7b78a75ce7df1e97808be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7535 5544 bytes
font_01_sfnt_off0000882b.bin
88f3917d7bc8e743f71cc7a5d2ad5a1dc75b541370990b2aaab860a87789cbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882B 9964 bytes

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