Malicious PDF — malware analysis report

Static analysis result for SHA-256 a319b8c8dcfbf95b…

MALICIOUS

PDF

50.8 KB Created: 2020-08-06 11:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee1eab25eaf3834c177ad8c0f1652045 SHA-1: 7fe348579d458341a5d3340110999f473388580b SHA-256: a319b8c8dcfbf95b0811287d3e2dea78f9365749affdbfa1ba2c23c179fb9521
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, many pointing to a link farm infrastructure designed to redirect users. The primary redirector URL, https://ttraff.ru/pify?keyword=basic+granny+square+crochet+pattern+pdf+uk, is flagged as malicious. This suggests the document's purpose is to lure users through a seemingly innocuous topic (crochet patterns) to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=basic+granny+square+crochet+pattern+pdf+uk
    • http://files.msdgloria.com/uploads/1/3/0/7/130775297/fefiwikenugefuw-jufejimolabepo-vezisup-rokazidonuv.pdf
    • http://files.inclusionatwork.net/uploads/1/3/1/0/131071043/f9811af4.pdf
    • http://files.surveyofps2.net/uploads/1/3/1/3/131380687/mamuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/42032125361.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/88946681892.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/89719839728.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/61386555496.pdf
    • https://cdn.shopify.com/s/files/1/0434/8752/7078/files/82963051371.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/37158578000.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/nuzegiripevugavodim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokadexowigexavutezirero.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7440/files/linuxafosuneboma.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/guxunotorilavofasot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/sazirukumalagiranusi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e2.bin
854a6db61172ee1b4cbd0c32a5d18085b351794dce0213bd51edbc0c2ed57568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 5608 bytes
font_01_sfnt_off000076e8.bin
92bf6febd07a8f605e8e2c3c37e8efd87d4e6ba67c8a4d1e7a0913a387c5622c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E8 9996 bytes
font_02_sfnt_off0000994a.bin
43474d2e3714e234d4e7ba65db87a53b75f9eccd8234adbab0f0d2658e2d5559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994A 16424 bytes
font_03_sfnt_off0000af75.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF75 4324 bytes

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