Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6628b0e4e134de8…

MALICIOUS

PDF

34.1 KB Created: 2020-08-24 06:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7a1aef45bc2ef50b872be1cd39897be SHA-1: d1d4fab774a65d0bf4752387d984b67d7c5a13ff SHA-256: a6628b0e4e134de8be0f8a34db06fa9cffdfdd726f2e51a36ffae7813bdbea50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=finder+forcibly+guided+contacts'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the true destination.

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=finder+forcibly+guided+contacts
    • http://sakur.promalvacations.com/uploads/1/3/1/6/131637309/xusebazo-zinuwowenediv-netolinamedidu-tesaxu.pdf
    • http://files.blaearlychildhoodcoalition.org/uploads/1/3/0/8/130873983/zupaso-wipigololodap-warato.pdf
    • http://files.cls-asia.net/uploads/1/3/1/4/131454436/77f72560d5.pdf
    • https://cdn.shopify.com/s/files/1/0462/3794/1909/files/28399711004.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/93794603742.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/xegesesozokumop.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/7586755526.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/40987441718.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/4673354203.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/51499578549.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/merozizok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/the_vmas_2015_full_show.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/daxipu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/96991978252.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/puliwokidaribebutiwuselik.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_off000047d6.bin
2f3eab24d55c013cc45db1a5f55655d8f7f6b2b544be56c278ffe8e6f8d194e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x47D6 5388 bytes
font_01_sfnt_off00005a37.bin
0fdc2f94e8a9d8f96c49cad271d8111c620a9c3b1c1baaec267e1cae9428d8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A37 9880 bytes