Malicious PDF — malware analysis report

Static analysis result for SHA-256 414d5fb6940725fa…

MALICIOUS

PDF

44.5 KB Created: 2020-08-06 23:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6f4418c90915f56736fc4f2c7c9d7f SHA-1: e3b5ba1eec9e0576c5012739049ba2f4b7e4d088 SHA-256: 414d5fb6940725fa59abe77780fe7fa2a857321e071d0f866db417980f4c35aa
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to 'ttraff.ru', which is flagged as malicious. The document body also contains this URL, suggesting it's the primary lure. The PDF is structured as a link farm, likely for SEO poisoning or to distribute traffic to the malicious redirector. The ML classifier strongly indicates maliciousness.

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=byomkesh+bakshi+books+pdf+download
    • http://files.seantheprankster.com/uploads/1/3/0/7/130776828/4147275.pdf
    • http://files.martismixedmedia.com/uploads/1/3/1/6/131606636/soxamorulisi_rinuguliv_titovo.pdf
    • http://files.jazatyorbadrive.com/uploads/1/3/2/8/132815866/kobefekidanidud.pdf
    • http://files.majercikmath.com/uploads/1/3/0/8/130813317/307918.pdf
    • http://files.theginlot.com/uploads/1/3/2/8/132815807/6369133.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/87416683959.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/59886357504.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/vurupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/98267683929.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/71421986102.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/tumaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/simanon.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/goruvadetedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/76080427393.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/sirutojamewugoxazukumadeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/dugomope.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/wojivobujabada.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_off000064df.bin
7515e132236c91918a53884f364b51c6135fc9bcc0c6f2fc47afa5f5247ec05e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DF 5632 bytes
font_01_sfnt_off000077fc.bin
f6e3c2880273d2531c3bb3130f3ccaab4eb0621537f73183534cbc1d94e15c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FC 14560 bytes