Malicious PDF — malware analysis report

Static analysis result for SHA-256 5748a0b27425db22…

MALICIOUS

PDF

65.8 KB Created: 2020-08-11 09:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0eae5bc4ab862e3b9f69d055e2dbc39 SHA-1: 2a9d858d7ed8ce745c2fb5147734cf113c6eaa00 SHA-256: 5748a0b27425db22b323baaee79c9ce5d94bcb69a546a00fd7c7e322d4049526
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=history+of+english+literature+timeline+pdf, which is likely used to funnel users to further malicious content. The ML classifier also strongly indicated maliciousness.

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=history+of+english+literature+timeline+pdf
    • http://files.adelaide-brushfencing.com.au/uploads/1/3/2/3/132302802/3ff77.pdf
    • http://files.utahenglishcreamgoldenretrievers.com/uploads/1/3/0/8/130874612/2271216.pdf
    • http://files.nnis.net/uploads/1/3/0/7/130776131/dajegukurewoniros.pdf
    • http://files.travelsuitsyou.net/uploads/1/3/0/7/130740536/6f250517d9afb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/vezosupojasirobubiduxese.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/16980987736.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/57225830150.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/cuento_bienvenido_bob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4220/files/79318022644.pdf
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/bumunotamivovajizovokut.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/vofoleguko.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/roxix.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/57846615561.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/88907227587.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/calculus_11th_edition_larson_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/cpa_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/17919732363.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_off0000c250.bin
b2ea0994c817905128f6ecdb55fb738969f18a31c665cb10e0bf118820e660c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 5516 bytes
font_01_sfnt_off0000d4e9.bin
eb202de84c0535b0fa4602cd826b2bcd6350c91ece7785234e7db87dde4a1396
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10792 bytes