Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c31a8d0fb38d6d2…

MALICIOUS

PDF

50.1 KB Created: 2020-07-10 07:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec867af08249530ff9658dd1319497d9 SHA-1: 2cb3393e32ad9da4af68aef8b96930ee41d4d412 SHA-256: 1c31a8d0fb38d6d2a7e3b3f031bd634120f440990cb35d9db5ceebd8dfb1eeb0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector and others to a link farm. This suggests the primary goal is to redirect users to malicious sites, potentially for phishing or malware distribution. 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/wb?keyword=baby%20nest%20pattern%20pdf
    • http://files.parramattagaolghosttours.com.au/uploads/1/3/1/4/131453394/zanevapoxibaj.pdf
    • http://files.crestviewcofc.com/uploads/1/3/1/1/131163976/2268022.pdf
    • http://files.scsoutherncrossfarm.com/uploads/1/3/0/7/130775267/30530a1ebd.pdf
    • http://files.oliveandaloe.com/uploads/1/3/1/3/131380618/muzosun.pdf
    • http://files.acappellakentuckiana.com/uploads/1/3/0/8/130815095/numawamexizatex-nijufebifalegag-xidaga.pdf
    • http://files.forgiveninchrist.net/uploads/1/3/1/3/131379219/4083869.pdf
    • http://files.kathymorrowstudio.com/uploads/1/3/0/7/130739362/1445330.pdf
    • http://files.gofflaw.com/uploads/1/3/2/6/132681507/kisuwoziwodogo.pdf
    • http://files.scoopsphotography.com/uploads/1/3/0/9/130969887/savadojulep.pdf
    • http://files.petoskeycenteriop.com/uploads/1/3/2/3/132302848/5228514.pdf
    • http://files.rhiannonthomas.co.uk/uploads/1/3/0/9/130969637/karifiliwu.pdf
    • https://fagasufirosi.files.wordpress.com/2020/06/lozekebogo.pdf
    • https://vegumakelaj.files.wordpress.com/2020/06/76879996846.pdf
    • https://kugedabi.files.wordpress.com/2020/06/71289867633.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46283819311.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_off00008853.bin
fe4b3cbe6482921e888033bd72a5693372c390a5c4e3ace1f70781c58d244ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8853 4924 bytes
font_01_sfnt_off0000990a.bin
ed25587c2fc759f11b8c5575b42cf9e7edbfc55d32c5a96be6d353b1779890a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x990A 10100 bytes