Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2d25f3a7699be0…

MALICIOUS

PDF

32.7 KB Created: 2020-08-18 20:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dd00a1bc7aec16a97dfa867359376b2 SHA-1: 869d40352a854c838c2114397139cd993598b40c SHA-256: 8c2d25f3a7699be06d281593930950dc394dca27fe81a1dcd88c8271ce61576e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link, 'https://ttraff.ru/pify?keyword=weather+report+in+cloverdale+california', suggests a redirection to potentially harmful content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links points to a content-driven attack, likely for SEO manipulation or to host further malicious content.

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=weather+report+in+cloverdale+california
    • http://kagelasov.danielspero.com/uploads/1/3/1/4/131453284/wadoforo-wamozuko-gonubivusen-namatikaxiga.pdf
    • http://nudutez.annapike.co.uk/uploads/1/3/1/3/131380600/bexajowubufa_gimemumed_susufolub.pdf
    • http://parexa.diypaintguy.com/uploads/1/3/0/7/130775734/kirajimivo_dasotefez_firulomiwuv_pinudulebuz.pdf
    • http://files.franciscanyon.com/uploads/1/3/1/4/131408103/wutidemufewoses-wijirozifawa-pemos-gavofax.pdf
    • http://files.thephronetic.com/uploads/1/3/1/4/131452982/tivifaro.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/original_book_of_mormon.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/legagogefijuwajifunatoval.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7936/files/embryology_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/56761620234.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1526/files/42712854616.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/behavioral_activation_handout.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/lizarusutuwigasadebifog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/botijilij.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/tefutelomemazaforibanexat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/bestway_pool_heater_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/95797435072.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_off0000454a.bin
29e7fa874ec0ab1081d01ff978aa1ff05ec68edfd0a74515d560c980d2afd760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x454A 5136 bytes
font_01_sfnt_off000056ce.bin
a26378e4c1d63f7c15fa1502ed021b54cd022470f862d4e1435ec84f24ec05ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CE 9040 bytes

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