Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cf471e66c63ea7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-16 23:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf52105a5f7f82d798763a6d67a39fb9 SHA-1: 332be5906148ab731b997445db394c2c48d11e9c SHA-256: 99cf471e66c63ea755955ea0bd2537615217c454e529b233d26cd373e6a42f9d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign content on shopify.com, but one critical link directs to a malicious redirector at ttraff.ru. This suggests the document is designed as a link farm to distribute malicious content or phishing lures. The ML classifier strongly supports the malicious verdict.

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=super+smash+lucina+guide
    • http://files.ed-conference.org/uploads/1/3/1/4/131406498/343051.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/99_names_of_allah_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7883/files/248151310.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/53048976882.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/dobuzezarekofanudonokebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/peptic_ulcer_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5222/files/70493158987.pdf
    • https://cdn.shopify.com/s/files/1/0433/2139/3320/files/52363192392.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/bu_jhansi_scheme_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0445/3682/3972/files/physical_science_grade_10_november_2020_memo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/72040791872.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/apple_airplay_free.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_off000060fb.bin
0555a15c48c95c985e346afea5bb8001fc479a12430761f3f117b30989b4445b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FB 5592 bytes
font_01_sfnt_off000073cd.bin
fdd69d8e672f921b433288120eaea668e51b4118b540ccc78a3d0992186601be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CD 10420 bytes

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