Malicious PDF — malware analysis report

Static analysis result for SHA-256 15149e755a6e5cd0…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 09:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a69e711743126be7234d2b8ac0dab510 SHA-1: 362de091ab5b0981b4a9827ec89f1319007dc49d SHA-256: 15149e755a6e5cd0c9f348df601b35c6eb8275abe0fab079175d9854113778bd
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet with answers, and the malicious URL is also present within the document body. This indicates a likely attempt to lure users to malicious infrastructure under the guise of educational 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.cc/pify?keyword=independent+events+probability+worksheet+answers
    • http://baxuna.scottpruysers.com/uploads/1/3/0/8/130874493/6057321.pdf
    • http://files.binghamtonrooted.org/uploads/1/3/1/0/131070895/xejepaloferexivi.pdf
    • http://files.suzannegrantham.com/uploads/1/3/1/6/131636930/c15241b3c.pdf
    • http://files.troop75.org/uploads/1/3/2/3/132303320/pelenolirapar-zupopok-zezobevol-xokivugovuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/93049116819.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/garawetuwugogexujo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/biomaterials_for_clinical_applications.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/99894395147.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2773/files/37684738251.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/bad_acronym_meme.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/41453243146.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/adding_subtracting_multiplying_and_dividing_fractions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/alkane_alkene_alkyne_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/79519291883.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/13532366180.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/zaxuwizaluku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/madilazuxukexo.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_off0000614c.bin
606046879af9521cdda493ac7ba87635dfe491536332577d14a59d6e35ca6989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614C 5444 bytes
font_01_sfnt_off000073d1.bin
ba91f20397eba4d37cdeb30c9bfa29a344f5269970aefe4651ebec7406b8bf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10192 bytes

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