Malicious PDF — malware analysis report

Static analysis result for SHA-256 82be1a56b19d3721…

MALICIOUS

PDF

41.2 KB Created: 2020-08-16 13:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9a16a8327ab31185180e22fe3fb11a SHA-1: 7ff838cdc9d92bfed2a0446cfaf78545bfe67649 SHA-256: 82be1a56b19d37216723cfc0ed7934bb006ecb7146d20f4453b96e00e2f9f7ef
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=olive+green+colour+formal+shirts. Another critical heuristic indicated a PDF link farm with 30 external links, many hosted on cdn.shopify.com, suggesting an attempt to obscure the final malicious destination. The document body contains garbled text alongside the malicious URL and several benign-looking Shopify URLs, further indicating a lure or redirection mechanism.

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=olive+green+colour+formal+shirts
    • http://tobumigi.thenottinghamfour.com/uploads/1/3/1/4/131483281/juxisowimasaripadix.pdf
    • http://files.desertratfeatures.com/uploads/1/3/2/7/132740519/2258186.pdf
    • http://modox.topicalbiblestudylessons.com/uploads/1/3/0/9/130969723/nubupeb.pdf
    • http://files.therapypdx.org/uploads/1/3/2/6/132681559/vizenixaxenodu-bugajajaguvu-medasevogiwov.pdf
    • http://files.soflamsc.com/uploads/1/3/2/6/132681452/solulite_wifuvekolaje.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0905/files/annie_a_royal_adventure.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/bimumisegaxiruwekupa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/39735875325.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/3378989692.pdf
    • https://cdn.shopify.com/s/files/1/0428/5651/3692/files/wobenejuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/dixofawasamarugakuviwobef.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/hunger_games_for_minecraft_pe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/15859333432.pdf
    • https://cdn.shopify.com/s/files/1/0437/5353/7690/files/80740423915.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/network_compression_threshold_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/pezuzirujidenomuduvar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/hate_crime_definition.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_off00006249.bin
e235d10254ab80ac1644cc1c04c20dee53bf70d36b50786265f3c122e6b919d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6249 5384 bytes
font_01_sfnt_off0000747d.bin
5776d2de5b34b7775b734569af713150fd9c0a1ccee2e92390e9428eca701dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747D 10192 bytes

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