Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a5b7c005d9200…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 07:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37563caa56891b5fbd099f5bab576fd SHA-1: 27b8e97244ec945f074a6cba75c0aa8967374c13 SHA-256: 829a5b7c005d92008bea5b129eb8577f670f6cf40e79daf349e183a859c818ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious due to a critical heuristic identifying a redirector link to known malicious infrastructure. It also contains a link farm pointing to numerous external PDFs, many hosted on Shopify. The primary malicious URL is https://ttraff.cc/pify?keyword=sharp+objects+imdb+parents+guide, which is likely used to redirect users to a phishing or malware site. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it was programmatically generated.

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=sharp+objects+imdb+parents+guide
    • https://cdn.shopify.com/s/files/1/0432/2938/0767/files/87392658764.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/fewokeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/wiravikunufudusop.pdf
    • https://cdn.shopify.com/s/files/1/0448/0499/7271/files/bank_account_program_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/vapibedufazeti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://static.usrfiles.com/ugd/98857b_76cbff1d8139456dbc3f98e2924deb57.pdf
    • https://static.usrfiles.com/ugd/95089d_bf323f59297b48098f46678f104e9e93.pdf
    • https://static.usrfiles.com/ugd/f63f29_db45c0ab8cca4a48a6da00e66ec0b372.pdf
    • https://static.usrfiles.com/ugd/dc98cc_82695e6718114613a3f0caaa430611be.pdf
    • https://static.usrfiles.com/ugd/5b5da7_dcc57c938ea64d5391363cd9596728e1.pdf
    • https://static.usrfiles.com/ugd/f63f29_cf56d2067a1b425986abe5bdde257c96.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_off00005274.bin
bbe2b618bca346e97e0d44b98b6361366d3607876454cf514625822490e41fa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5274 5656 bytes
font_01_sfnt_off00006582.bin
f79c4f5361137cc9468eb7766186bdceb7c99302d51d822849c1a57b6a78a569
pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 10184 bytes
font_02_sfnt_off00008860.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 4324 bytes