Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fae290243dcc93…

MALICIOUS

PDF

43.1 KB Created: 2020-08-18 19:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fafbf5fcf643d5953d885877b102a394 SHA-1: 420f197cf131ae3da02bc67d59c3a744c68b5bf4 SHA-256: a6fae290243dcc935f36a8b4143fc985476216d82f6a9829cce318acaf64e9f6
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=kindergarten+common+core+standards+math+worksheets, points to a known malicious redirector. The document body also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many hosted on seemingly unrelated domains, indicates a potential link farm or SEO manipulation tactic.

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=kindergarten+common+core+standards+math+worksheets
    • http://files.centralmathshub.com/uploads/1/3/1/4/131408056/baxoraf.pdf
    • http://files.southernmainewritingproject.org/uploads/1/3/0/7/130775830/zovaluvi.pdf
    • http://files.gahperd.org/uploads/1/3/1/3/131398008/safulisob.pdf
    • http://files.ericgamalinda.com/uploads/1/3/0/8/130874102/635348.pdf
    • http://xilunos.brhsband.org/uploads/1/3/1/6/131606624/dowebafaje_xopinateku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/finogobukewela.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/86256330865.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/kipodedes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36103472339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/flight_simulator_x_mods.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9646434013.pdf
    • https://cdn.shopify.com/s/files/1/0430/4892/7386/files/xopuvumamet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3035/files/bubufizuzuwi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/pazewujifewoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/27842249052.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/perodorado.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4d.bin
3f853f8ae867e1ee53408f6528433a8337f4e0aacd138a42448dd72514692534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4D 5448 bytes
font_01_sfnt_off00007eaf.bin
a7e468f06173cbec1ef09c721585148fe09f90cd2ac62317cb2ee7af0abd1d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAF 9456 bytes

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