Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed1cbcf714d5ef5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 11:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19feee918a2d639f892512600464d41e SHA-1: 8c4fb1136964a77d79ff9c9bcda475dc6a67d2bf SHA-256: 3ed1cbcf714d5ef51d7c7b8e609f873e345d3039863f6a9b687ce701d37b9bd2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML 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 PDF links, with the primary malicious link pointing to 'ttraff.ru'. The document body contains garbled text but includes the malicious URL and a seemingly unrelated PDF filename, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=1920s+stock+market+game
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/naruto_arena_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0447/0249/8970/files/audiobook_application_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/giwizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/petarexetorexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/convert_m4b_to_mp3_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/army_rappel_master.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7431/files/best_english_to_arabic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/fuxosa.pdf
    • https://cdn.shopify.com/s/files/1/0449/3679/0171/files/community_acquired_pneumonia_case_study.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6ded65ed64640508ddf66f5508659ab.pdf
    • https://static.usrfiles.com/ugd/2b25b5_aac3ff8ab4b346daa8863b7d2bd6d0c7.pdf
    • https://static.usrfiles.com/ugd/253000_8256aab75ada4a5286f82400d3b36983.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_off00006426.bin
e360561785297ffab3312807746d32949ca7ab2d975b2c13961434ae31848f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6426 5540 bytes
font_01_sfnt_off000076e1.bin
595c19a09faf6cc69c6a66cc55e2c9a6074928f93306c40e9220a345943da012
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E1 10656 bytes