Malicious PDF — malware analysis report

Static analysis result for SHA-256 045d2e66dfbd8df4…

MALICIOUS

PDF

37.7 KB Created: 2020-08-15 18:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b6f79365e607b983db82f57d458d0da SHA-1: 84298fa9612c36860ef11501c6be3473d8e08f36 SHA-256: 045d2e66dfbd8df4f39ac834e664745cab8e86044671e5f5826a7c607fb298f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector link to malicious infrastructure. Another heuristic flags it as a link farm, indicating a large number of external PDF links. The ML classifier strongly suggests maliciousness, and the embedded URL points to a known malicious redirector.

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.cc/wb?keyword=bear%20apprentice%20iii%20manual
    • http://verer.comefindyourstory.com/uploads/1/3/1/4/131437502/eedb5b330b176.pdf
    • http://files.colorwheelsmobileartroom.com/uploads/1/3/2/6/132682934/kaputate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/71694629096.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/robugotenuwupokakuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/anyone_lived_in_a_pretty_how_town_poem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/rovunivekijapit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/smoothie_recipes_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/lafivupabazeporiged.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/58830261495.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/63801471361.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/nedefirefabevewiregixuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/12820009568.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/telututemogek.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000577e.bin
ba4989d98d9a4886076f91281689c700025900aee7c9fd405f2a2d6a960ba705
pdf-font-stream PDF embedded font (sfnt) at offset 0x577E 4952 bytes
font_01_sfnt_off00006831.bin
67395a4a7d6daee042b045c8417be0074f0035619573f622693b92576cc347e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 10032 bytes