Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbc1f0037238fa3…

MALICIOUS

PDF

48.2 KB Created: 2020-08-23 20:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177d28c3b7cf1468b1f13ef14f0adb01 SHA-1: 6b836f8533d513a759a1c897d9f6d5fe4dab6924 SHA-256: 4dbc1f0037238fa362f9111954bff539f3e0997c7761a054dd2cdd5ea49b45d6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=re+admission+form+of+ignou'. This URL is embedded within the document body, suggesting a social engineering lure to trick the user into clicking the link. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=re+admission+form+of+ignou
    • http://bedusize.menonlyadventures.com/uploads/1/3/0/7/130740072/tidinuwar_mipazeluxodib.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/safari_online_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0463/2749/6859/files/psychological_evaluation_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/kepifugimiripumana.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/68153391821.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/path_of_exile_marauder_guide_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/43388673131.pdf
    • https://cdn.shopify.com/s/files/1/0460/7862/3908/files/android_emulator_windows_10_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/27350970445.pdf
    • https://cdn.shopify.com/s/files/1/0445/3980/5855/files/mafunumeladiwusijipu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/7428406088.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007356.bin
dfced0e5bdeb491ca42e218194b096e3de69409ca10fd2f7cd4dc3c021c34d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7356 5200 bytes
font_01_sfnt_off000084f6.bin
e76db2ea3e7beffc8fdacfa79e3209d6fee566e259fd861c78ec4bab953feb29
pdf-font-stream PDF embedded font (sfnt) at offset 0x84F6 10012 bytes
font_02_sfnt_off0000a776.bin
c949b85423a8c21089ad818f623c7f845d43581bd5d05ceec5360a093cc0a7e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA776 3180 bytes