Malicious PDF — malware analysis report

Static analysis result for SHA-256 548d87c7bb46e231…

MALICIOUS

PDF

39.3 KB Created: 2020-08-21 23:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef2ed0855f875df7f38cf510d40c90d2 SHA-1: 6f72deaf58d211601debc6e15ada1f634c985902 SHA-256: 548d87c7bb46e2310901d8e279a99b3d2debcb5576be07defbfde322162354db
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cereal+magazine+pdf. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was largely unreadable binary data.

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=cereal+magazine+pdf
    • http://nuwokumeb.apachetrailchapter.org/uploads/1/3/1/1/131164112/fupuwipujas-goroz.pdf
    • http://files.cassandraarthur.com/uploads/1/3/2/7/132710624/3819004.pdf
    • http://kisusarod.sirensalongvl.com/uploads/1/3/1/4/131407995/760951.pdf
    • http://ritor.microlibrarybooks.com/uploads/1/3/2/7/132740449/mulatuzokasowuguku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/detafosiwarag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/podidalodorosumuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/1999_chevy_s10_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/0054/2878/files/gebegu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3585/1928/files/2140521805.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/soteferododifotulilax.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/sat_algebra_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/73423798104.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/28587773321.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/25768290294.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/tozegasijiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/biochemistry_final_exam_questions.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c04.bin
ee91ac17ccad9e277de6f77ff989a018efe4a9c0b75abc15d7ecdd423595fd98
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C04 5140 bytes
font_01_sfnt_off00006d6c.bin
e76bc51881419f869229f172439de7326d7d7208b4ba5f4caa7616edd131edb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6C 10308 bytes