Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b34b007a3ca117…

MALICIOUS

PDF

40.3 KB Created: 2020-08-28 06:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6bb4430c47658b243059f7b064ad90d SHA-1: 7f2024a1787e81c58acd16eb06ec05db2c27c9d2 SHA-256: b8b34b007a3ca11716f5a998c0549dde6e3035cbb9346dc529fd15acce1a86f6
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, a common technique for creating link farms to manipulate search engine rankings or distribute malware. One of the primary links, 'https://ttraff.ru/pify?keyword=genel+matematik+1+murat+g%25C3%25BCzelte', is flagged as a known malicious redirector. While many other links point to benign Shopify domains, the presence of the malicious redirector and the overall structure strongly suggest a malicious intent to lure users to harmful sites.

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=genel+matematik+1+murat+g%25C3%25BCzelte
    • http://nopepu.medicalimagingstore.com/uploads/1/3/2/8/132814038/0e847e9.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/alphabet_japonais_hiragana.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/9042010394.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/xukepapidunivobaxufevuko.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/custom_slack_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/tipetudulupot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/78736201882.pdf
    • https://cdn.shopify.com/s/files/1/0440/1345/3470/files/cover_letter_for_job_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/2098756627.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/xawowafixaxum.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/tekejujejisileb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/87905615215.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/duzipafupiwepezovitiwafam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/analytical_geometry_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/22409131182.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_off00005b44.bin
5bc1f63758a0e1519829f7a16a699ca7010db38542cee47de87a51b9df37d145
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5144 bytes
font_01_sfnt_off00006c8f.bin
41b1058aa2aa42bee7e0b682b233394545b5c66d988434fe74c1e0c41ad99134
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8F 12140 bytes