Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b73452f09fab4b4…

MALICIOUS

PDF

46.8 KB Created: 2020-08-10 10:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29efd9945c8dab1574e36598f735e0d9 SHA-1: a906045c6f77afde724e8f7990bc4b9fecd98e25 SHA-256: 9b73452f09fab4b406a0a4ba7c480dfa3c1aa432a0ba296dc16344ccb766aa22
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm. One of these links, 'https://ttraff.ru/pify?keyword=tell+about+yourself+in+interview+for+freshers+with+answers+pdf', is identified as a malicious redirector. The document body text is garbled, but the presence of the redirector and the link farm suggests a malicious intent to redirect users to harmful 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=tell+about+yourself+in+interview+for+freshers+with+answers+pdf
    • http://goxod.tysonwestley.com/uploads/1/3/1/3/131384771/zexixuxitefet.pdf
    • http://wifotu.primetineoutdoors.com/uploads/1/3/1/4/131452883/e781da229c9e.pdf
    • http://ratagelij.designamanila.com/uploads/1/3/1/4/131406082/3003903.pdf
    • http://files.foundersparkhighlands.org/uploads/1/3/1/4/131453633/xojupinitumom.pdf
    • http://files.katemarch.com/uploads/1/3/1/3/131380493/lapolezogurasedaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/tipos_de_bosques_tropicales.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/85106486459.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/gederokexuxajivagexup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/44603158743.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/road_trippin_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/ximovuguditigogevabex.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/39874895850.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/63294371308.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/ziduzaxugajikadaranewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/perimetry_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/27105958822.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/sobapidoxokixokewiku.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_off000077ae.bin
e593d32bcd1a9b637ca9925b394bd8dfc54f5f9b3e61cca1810e4cc053d861c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AE 5472 bytes
font_01_sfnt_off00008a55.bin
aa8e332904e2ca7315d36d91be54982a1a7ed47962b59459e3ba14223146a5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A55 10244 bytes

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