Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bad80d6e7c61d09…

MALICIOUS

PDF

41.5 KB Created: 2020-08-17 18:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b7d03ae2bdf0f444839b39e70649ac SHA-1: 9e7cccb16eaed839d7b5a174a5a25cedf1b784d1 SHA-256: 1bad80d6e7c61d09f1eff6dc890e2254099d311d69588281ebd54ccc82d10172
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, while another indicated a large PDF link farm, likely for SEO manipulation. The document body contains a URL that appears to be part of this link farm. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect users or manipulate search engine results.

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=against+the+current+gravity+album
    • http://vubabi.seybridgepharmacyandgifts.com/uploads/1/3/2/6/132680813/binisanafefeda-gogorogizavuw-bemovikaxowolof-gotenugavekozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/zakafedaboguvabavizede.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/muwenurebowuxutupon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4755/files/dilokawutaxeku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/vetizir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/waxamubusowumegika.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/96809189582.pdf
    • https://cdn.shopify.com/s/files/1/0437/4419/8805/files/37155326412.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/tunasugesizikufimumaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/63476585339.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/gozixixofaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/grep_command_in_linux_with_examples.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_off00006307.bin
9956ebe7f4cc26f3bb09bd0ce92283e34c868dc07f0db5163155abf121e67621
pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 5504 bytes
font_01_sfnt_off00007599.bin
6406008e70d0e28227e196761d13c76a4679cc22a649159b63f1c704a3538314
pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 10484 bytes