Malicious PDF — malware analysis report

Static analysis result for SHA-256 feffaf5377f6bf05…

MALICIOUS

PDF

62.2 KB Created: 2020-08-12 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7152c7eb1696c102f4d43bea00184ce SHA-1: 90eda3aa316d3ec15c6e45afa59a4fec86a54496 SHA-256: feffaf5377f6bf059c605ff60a06350649f0ee36fd18af1e2814b62bd2fbdb42
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to books and the URL https://ttraff.ru/pify?keyword=bhaktisiddhanta+sarasvati+books+pdf, suggesting a lure to download further content or redirect to malicious sites. The ML classifier 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.ru/pify?keyword=bhaktisiddhanta+sarasvati+books+pdf
    • http://files.vc-wares.com/uploads/1/3/0/8/130874122/wapexejako.pdf
    • http://gofeviz.midviewband.com/uploads/1/3/0/8/130874359/tifutes_siwowadev_tuwen_lesusoji.pdf
    • http://loxamez.darksidegym.com/uploads/1/3/1/8/131871592/2422388.pdf
    • http://vexajewo.mslaneapgov-econ.com/uploads/1/3/1/6/131637223/8555465.pdf
    • http://files.trinalang.com/uploads/1/3/2/6/132682829/fizaruke_wajozidi_vilolukasodojar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3455/9143/files/fovozumogixakexovejazasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/5052430349.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/22521092803.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/13984885355.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/balcony_steel_grill_design_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/44010926385.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/appsc_group_4_previous_papers_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/19221618410.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/61309654819.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/25343451454.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/80947645263.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/tetugagumas.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_off0000957c.bin
101640f501ba036736ebeca6ad76c7b8029533fdaed74820c7ff9a13d4c99a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957C 5412 bytes
font_01_sfnt_off0000a7cf.bin
85285614d10929d0c5ccf88de699980ce4d8a7cf2e1f58d6d8563117c4d4899c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CF 6284 bytes
font_02_sfnt_off0000bc8d.bin
fd3373ad89861cc60c9d00002f0a4a7b85bd6821e46ccd1b6df8cd33f61e956d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 15828 bytes

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