Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd11ee85c78b66…

MALICIOUS

PDF

76.9 KB Created: 2020-08-07 22:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4a51bf7bdcef07383cc351f7d910ca SHA-1: cad41fcb953284259c5719582f3e51687f78f041 SHA-256: 25fd11ee85c78b66357d34ddd9462afb02d6f0dbe47f205ff33f9336ee4de1fc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to "Tn budget 2020 in tamil pdf". The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=tn+budget+2020+in+tamil+pdf
    • http://files.jackacarjackupyourlife.org/uploads/1/3/1/3/131384293/9681265.pdf
    • http://files.clubbingfraggles.com/uploads/1/3/2/6/132683000/zesewizegodulizabaxa.pdf
    • http://files.tyreemcgill.studio/uploads/1/3/1/0/131070051/popukajivebezojeni.pdf
    • http://files.diannestclair.com/uploads/1/3/0/7/130738887/f6c4ea8cd16e0.pdf
    • http://livopadur.suite-harmony.com/uploads/1/3/0/7/130738970/tenadapalir_rumufajumubagev_roworidewi_renekexafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/4330648791.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/sijaxevinowofivujekusaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/monaru.pdf
    • https://cdn.shopify.com/s/files/1/0435/7314/9859/files/murder_set_pieces.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/al_waqiah_surah.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/female_asu_measurements.pdf
    • https://cdn.shopify.com/s/files/1/0429/2870/1603/files/34459927041.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5020/files/bibaser.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/regokivizomemak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/pronunciation_english_in_use.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/fuvuwupuxofar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/zoregupitubogojafas.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/6092728818.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/zipezedivu.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_off0000d90a.bin
725e0e87f27f5ddce9ae203b1369e3b216e6508a5116867e0c4f71fd30fa0d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 5452 bytes
font_01_sfnt_off0000eb82.bin
3678ebde049bfe67c84e610398fed2d33c0d485406314e1d14ca947aef79a6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10836 bytes
font_02_sfnt_off000110d2.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16164 bytes

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