Malicious PDF — malware analysis report

Static analysis result for SHA-256 80945a832543d353…

MALICIOUS

PDF

44.5 KB Created: 2020-08-22 10:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddaffa544ccfb19fe9d7879140130c8d SHA-1: 4aeeb39d5bc03f63b8a74c2ab9c8033750eefe31 SHA-256: 80945a832543d353f857642ea49af3e3b818f3b2c64384bf298ca38693032e72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, masquerading as academic references, which is indicative of a link farm or SEO spamming technique. The primary link identified leads to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=references+apa+format+examples
    • http://files.spineacademypt.com/uploads/1/3/0/7/130738836/vesewuvimi.pdf
    • http://vosugej.antsrus.com/uploads/1/3/2/6/132681482/3351142.pdf
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdf
    • http://wakegok.solorzanollanos.com/uploads/1/3/0/7/130738568/5659321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/39984638728.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/wasovuvuparom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7218161301.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/xigetesowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/bitsat_mock_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/73295159332.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/jovidota.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/silkcraft_freezer_paper_sheets_a4.pdf
    • https://cdn.shopify.com/s/files/1/0450/0642/2184/files/manevixino.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/gujozafeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4657/files/xinefaveleduzojaduj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/5897771802.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_off00007018.bin
275c7748da12b7428027faf9c287cdba5eb514be95a37a1a9f90957e097039dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7018 5236 bytes
font_01_sfnt_off000081d8.bin
66a8419978ab5173da75e4cb5ae41011b3b64d41ce0f440bc23ec5bb1871b6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 10120 bytes