Malicious PDF — malware analysis report

Static analysis result for SHA-256 780fda0c18e58257…

MALICIOUS

PDF

43.4 KB Created: 2020-08-09 06:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e783a8121d4c183860ba0322406e62b SHA-1: b4bdd5a7317e4cda0a894610dcb9e95488880e2a SHA-256: 780fda0c18e58257065eb82652c7f14a280cb260ea8409ba1c2ac76764ebaeef
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=blends+phonics+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking the malicious link, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=blends+phonics+pdf
    • http://files.yaksaks.net/uploads/1/3/1/4/131438038/589956.pdf
    • http://nasonagax.stmaryskcmo.org/uploads/1/3/0/7/130775432/wupefubuvesusep_xebomumufopakez.pdf
    • http://files.theoffbeattraveler.com/uploads/1/3/0/7/130775515/lefadejivewipaxibet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/86842770310.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/business_environment_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/rewizumataxilopojek.pdf
    • https://cdn.shopify.com/s/files/1/0447/8251/8421/files/has_been_has_gone_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/design_thinking_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/24955821021.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/alphabet_letters_images.pdf
    • https://cdn.shopify.com/s/files/1/0437/0009/3083/files/28230021342.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/55265684501.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/biological_anthropology_stanford.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/lakunivuvawawujapufap.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_off00006cee.bin
a462afa7e0998898dd8eb33098caec82e05f18526c33071349d489c23e89e87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 4984 bytes
font_01_sfnt_off00007df0.bin
f0d1467a24df120ad6f223cdc99aa6e01d5f08abbe38454d27e361821097198c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 10288 bytes

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