Malicious PDF — malware analysis report

Static analysis result for SHA-256 0161191b672c35df…

MALICIOUS

PDF

46.5 KB Created: 2020-08-23 05:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 744858f6d2e91da1bd437f6a989d8bc5 SHA-1: 73387e43f8bcd442fd208f32a98d21464a5d1279 SHA-256: 0161191b672c35df73676dcb86c9b5dccf1b994775a95f7d0d850abd95780073
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=adjectives+performance+appraisal, which likely serves as a gateway to 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=adjectives+performance+appraisal
    • http://tadafi.imsweightlosscenter.com/uploads/1/3/1/3/131398455/kakubijum.pdf
    • http://risumiva.portellowinecafe.com/uploads/1/3/2/8/132816066/b54c466c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/nusuvilebuwoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/pubg_mobile_hack.pdf
    • https://cdn.shopify.com/s/files/1/0434/5793/7561/files/67201898843.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/tewewefiriwibufaxisakemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/worksheet_for_commutative_associative_and_distributive_properties.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/conceptual_chemistry_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/0505/6920/files/loctite_222_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/jozozarubazunajegadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/89567643510.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/sipotirimajirajivobolip.pdf
    • https://cdn.shopify.com/s/files/1/0438/8090/6907/files/after_effect_slideshow_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/current_affairs_january_2020_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/wazunesigarubesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b51.bin
6bd183d9d8692abb9cca95bc925d348c7b5bb24e86a338eac5ac18729c2a88f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 5212 bytes
font_01_sfnt_off00007cf4.bin
36abebb2f02018231bc8a28aa8ff70f5d2da510437828d0330708246a20e4b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF4 10004 bytes
font_02_sfnt_off00009f2a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2A 4324 bytes

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