Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e292d02f59504d3…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 16:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 437b7fabad09b800f595814d08ba4fc8 SHA-1: 9c8c46746ee9811d8f8c1bb78abec96090823084 SHA-256: 6e292d02f59504d3f815c560c536a42a01adef4cff5486f391c251aff701dff7
194 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to link farms and redirectors, including a critical finding of a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=risk+assessment+template+for+school+trip`. The document body, though partially corrupted, suggests a lure related to a risk assessment template. The presence of multiple external PDF links, some algorithmically generated, indicates an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=risk+assessment+template+for+school+trip
    • http://jexoxuxud.shrewsburydaycare.com/uploads/1/3/1/4/131453060/xajev.pdf
    • http://kosidas.studio2corning.com/uploads/1/3/0/7/130738799/5916651.pdf
    • http://files.richardgmont.com/uploads/1/3/1/1/131163986/2452897.pdf
    • http://kubafev.brucereevesswiftamericasartist.com/uploads/1/3/2/7/132741029/1099581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/papitapaxijitawonidemulax.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/virenedesoku.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/82176081189.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/42961856446.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7592/files/88735083772.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/gemasulaware.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/dnd_5e_size_advantage.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/auxiliary_verbs_esl.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5252/files/noneluludafele.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/fosowenexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/sewasodulowaji.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_off00005e7a.bin
c90947cdb706d145594deb42f40da76872322ecf635d744bda6624c14e9feada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5328 bytes
font_01_sfnt_off0000706f.bin
35da821e7ca21d28055857f24f736476722c71672e7e8924063caf4faa8b2f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706F 10144 bytes

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