Malicious PDF — malware analysis report

Static analysis result for SHA-256 382c99f3b68d0b60…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 21:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035a472861a72b83707511e5398f3e0b SHA-1: ef84d8618998bd7a7739708048b9fba636e39b46 SHA-256: 382c99f3b68d0b603d2db2edcdb23a07adcaf2e17719a49c41d1d4103c7e6ae1
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One of these URLs, 'https://ttraff.ru/pify?keyword=battery+doctor+premium+apk+free', is identified as a malicious redirector. The presence of a large number of external links suggests an attempt to manipulate search engine rankings or distribute malicious content through a network of sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=battery+doctor+premium+apk+free
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/71069254223.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/xasakedewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/titanium_alloy_properties.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/murugiponivimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4658/files/gitakawawesumufisubaw.pdf
    • https://static.usrfiles.com/ugd/760101_e650df5f5d6c4d73b986feae39908317.pdf
    • https://static.usrfiles.com/ugd/12f4eb_8449c701a7b54dd09f3a4b7f9190828b.pdf
    • https://static.usrfiles.com/ugd/585b1d_02aed091fe154d78a9ad2d692468b819.pdf
    • https://static.usrfiles.com/ugd/34ec99_423c6d5bc84d4982bf3b55c91b22c75e.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/kiwumafobuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/jemaruwumarinuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/breaking_free_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/strength_of_materials_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/xamul.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/47428315005.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_off00006232.bin
edecd5a326632c9c0e519b8882134b21a5aec42d7d434c285d0dbef783d4468d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 5304 bytes
font_01_sfnt_off0000743a.bin
a0dc7b1daac31adb648926779b09062c455efb6662e64adc893043a5f0249796
pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 10588 bytes
font_02_sfnt_off00009868.bin
fcc7e4654da362a473f11584b9a67ed3952d4e4e977df02604b2b05c381ebd4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9868 16668 bytes