Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb883284308e19b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 07:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf5871980408e883fc6ab2d429613b1 SHA-1: c443b38e277aac44a37e34e2b1816409be5046dc SHA-256: bcb883284308e19b8725b627a31a69f204293ccd549ccb5c065df7b6f210e03f
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are disguised as legitimate PDF documents hosted on platforms like Shopify. The primary malicious link, 'https://ttraff.ru/pify?keyword=beyond+compare+3+pdf', is identified as a known malicious redirector. This suggests the document's purpose is to drive traffic to malicious sites, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=beyond+compare+3+pdf
    • http://files.libertybellflags.com/uploads/1/3/1/3/131398487/9eee0725.pdf
    • http://tapeje.northjardotchurchofchrist.org/uploads/1/3/2/7/132710780/forufelodetu_letidalar_mefefumunomo_zixat.pdf
    • http://files.mainetwpadultlearning.com/uploads/1/3/0/9/130968926/zumodafobu-narenozi-linega.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/aashto_lrfd_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/azeotropic_and_extractive_distillation.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/rirak.pdf
    • https://cdn.shopify.com/s/files/1/0437/2532/4439/files/canon_t70_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/cebuano_worship_song_lyrics_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/pokeriti.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/45673418720.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/99948847628.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/types_of_casing_in_centrifugal_pump.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6086/files/meloretikebaxevoxizano.pdf
    • https://cdn.shopify.com/s/files/1/0436/6955/3305/files/rinabokuxuromijalosozav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/jaxajodefixizusege.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_off00006561.bin
7c1440ca6a89e599487e7d32636174cccb5b67691b4b40ddd6b099a69451f7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5404 bytes
font_01_sfnt_off000077be.bin
51e5808c6166252654cf25ba8b52f80489df81e219ec23188606079b4a65945e
pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 10340 bytes