Malicious PDF — malware analysis report

Static analysis result for SHA-256 933fbb444936d522…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 05:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eae29589ce1b6cbd3612f1e2cfab510e SHA-1: c9c5cf3fb6ec938b367f0b763b10dc2a5b5e4067 SHA-256: 933fbb444936d522b2be80bcfe32ddb23bcf0ea716d7482d5ba2d1213661b5c0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector, which is likely intended to lead the user to malicious content. The ML classifier also strongly indicated 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.com/pify?keyword=ittle+dew+2+puzzle+guide
    • http://files.tuscanrenaissanceacademy.com/uploads/1/3/2/6/132682640/fewerotunanisi.pdf
    • http://files.pimpyothrone.com/uploads/1/3/0/8/130874317/5277845.pdf
    • http://files.midmerry.com/uploads/1/3/1/6/131637953/1013269.pdf
    • http://files.semperparatuspelli.com/uploads/1/3/1/3/131380440/votilufavudanevu.pdf
    • http://pekemen.journeystoflavors.com/uploads/1/3/2/6/132681352/lezapuwaromududub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/lixajimebatagofukudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/communication_matters_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/anna_karenina_leo_tolstoy.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/journal_of_flood_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/lepujuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/backhoe_attachment_for_skid_steer.pdf
    • https://cdn.shopify.com/s/files/1/0446/9257/0268/files/gadavitirebej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/job_interview_conversation.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/zububumarufovuxopaxa.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_off000062ca.bin
0c7675cbd3c387171c7d2a63456da6381acbc391df3f152a20d2b7414a96fbf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 4852 bytes
font_01_sfnt_off00007385.bin
489e1442e49d87265a6e56f35d9362622d8be02c5ed232d053a3616abdc0a15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7385 10088 bytes