Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9806413a6058d6…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 15:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f3865ae1dde97a2128af7e769818ce SHA-1: f9bbcd8460063d6def47bac8faad23c022860143 SHA-256: df9806413a6058d625447f15885b5d0eed733951188c2f025ddd2b88981b0709
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text suggesting a file conversion lure ('Psd file to pdf'). The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious sites.

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=psd+file+to+pdf
    • http://files.mikethecarguy.net/uploads/1/3/2/6/132681233/tasotazolupo.pdf
    • http://files.atheistsurvival.com/uploads/1/3/0/7/130739776/nefurex-zefafobakexezi-wadokut-pofadubifu.pdf
    • http://fegekubeg.sdkuykendall.com/uploads/1/3/1/4/131438539/634ac0a7cce5.pdf
    • http://files.eliteedgesss.ca/uploads/1/3/1/3/131382470/puzibujemibaz.pdf
    • http://files.tampabayfm.net/uploads/1/3/1/4/131453350/duveb-dijir-lifajajomi-tumolisoxuwifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/kinuxetofexow.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/gapujijajeneruteb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/fatovavexusonepeku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7843/files/2162196227.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/list_size_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/82487931656.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/nogovemixilefalenegojega.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/warhammer_40k_ork_codex_vk.pdf
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/pytorch_initialize_weights.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/73323300459.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.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_off0000650c.bin
f65b519419945a61d811488060a277516ab07626a2816a26a588cd3c745d8930
pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 4728 bytes
font_01_sfnt_off0000753d.bin
5799e8c4c3775b02311227eb76b16a32eee5aeb51269f14d19f1241f1269e647
pdf-font-stream PDF embedded font (sfnt) at offset 0x753D 10364 bytes