Malicious PDF — malware analysis report

Static analysis result for SHA-256 7826d46157ae4f5b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-10 01:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4b127ad27ab7132e1d45435c7611a84 SHA-1: 9a386ca5c1f371ddb45c0feb15ca70d9a3279b09 SHA-256: 7826d46157ae4f5b4e178a479347f67ac00c3b2f4d2c5bc0cde69ef992382bf3
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though malformed, contains the same URL as the redirector link, suggesting the primary intent is to lure the user into clicking this malicious URL. The ML classifier also 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.cc/pify?keyword=artaud+van+gogh+el+suicidado+de+la+sociedad+pdf
    • http://files.shininglcc.org/uploads/1/3/2/8/132815916/foxoguwuxi_tarupak_zumasopixivim_gufewimugebivej.pdf
    • http://files.steadfastanimalsolutions.com/uploads/1/3/1/3/131383630/9911318.pdf
    • http://files.thecandyshopprints.com/uploads/1/3/1/6/131637147/1162273.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/kilenaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/lenovo_11e_chromebook.pdf
    • https://cdn.shopify.com/s/files/1/0449/1870/2247/files/say_something_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/bavulanolewetaraxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/74041577516.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/gididugoxisitaroda.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/81645248637.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/15_minute_binary_options_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0446/7310/6083/files/kinematic_equations_for_uniformly_accelerated_motion.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/dobokom.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_off000068e2.bin
bb1a0dfa0d00180315686d3120b381ae5ebed03ac4321e0fdccc6188e7227c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E2 5464 bytes
font_01_sfnt_off00007b82.bin
252e4f01d82b2c03fd48926cffe586631406e9cd27e8a0f692e7ab468b07cbda
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B82 11356 bytes