Malicious PDF — malware analysis report

Static analysis result for SHA-256 95677cfce54856e7…

MALICIOUS

PDF

46.3 KB Created: 2020-08-17 00:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51e29d433f898ecb59be9bca6985174 SHA-1: ad98e15c01f0f2ca3c1c2c69f9a91e4b9cc3118b SHA-256: 95677cfce54856e7b02a2d36b87deb03795f2cac88c00b531f227696c636df36
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), and another flagged the PDF as a link farm. The document body itself contains the text 'Guided reading activity 18- 1 answers' and the malicious URL, suggesting a lure to trick users into clicking on the embedded links, which likely lead to further malicious content or downloads.

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=guided+reading+activity+18-+1+answers
    • http://vebufom.stmarysautorepairandsales.com/uploads/1/3/2/8/132814900/1228215.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/alternator_wiring_connections.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/wagajedib.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/90274970532.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/futetumekosetadijexuwavem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/causes_for_disequilibrium_in_balance_of_payments.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/xewufomaguguverenes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/53355003463.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/pagarub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/xivinogadafezipaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/wasibafewajoropurakewap.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/types_of_actuators.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_off00006a5b.bin
2d4e373169f30e4d96edd019185cf7568bc47cc4b4f15f2eb3436dbfdba0da19
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5640 bytes
font_01_sfnt_off00007dc3.bin
27f84e5a858ee517749e95e158b89396cbbad00971822ad239639d20b9d68904
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 14836 bytes