Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c3d2b5eae46ce3…

MALICIOUS

PDF

47.4 KB Created: 2020-08-21 00:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0955e6098b70af2c6818f978fefc881 SHA-1: 77856f9add3a4e5dca930f9e3154bcfd8ebe2984 SHA-256: 86c3d2b5eae46ce35f8d00292958ae82f528bf87014253d166f9dcdb4f80d034
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector hosted at 'ttraff.ru' which is associated with malicious activity. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for downloading software. The presence of numerous links to PDFs on Shopify domains, some of which are benign, indicates a link farm strategy to improve search engine ranking for the malicious link. No scripts were extracted from this sample.

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=vlc+media+player++apk+for+pc
    • http://files.plymouthkarate.org/uploads/1/3/1/4/131453499/4606674.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/34197496061.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/67967930556.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/21474162848.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/7858572551.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9132/files/baldwin_giovanni_s_room.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/96510011249.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/zibem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/wazod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/coding_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/tolixefabumuwewesoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/clasificacion_citologia_cervical_bethesda.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/pumumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/63123295747.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_off00005e2b.bin
2608dfdaf7b32c96e6401807ef1ebc27ef71bd106e554c13f5a7d0533bd99cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 5256 bytes
font_01_sfnt_off00006ff0.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF0 1800 bytes
font_02_sfnt_off0000787d.bin
c7e7bf1495dd37b4343aa60f5c16c434cdab3b9d16398b01e68965b3a1e18f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 10056 bytes
font_03_sfnt_off00009b40.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B40 16144 bytes

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