Malicious PDF — malware analysis report

Static analysis result for SHA-256 196cccccb40dd8cc…

MALICIOUS

PDF

51.6 KB Created: 2020-08-16 20:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ffdd3f472c8f578fa1aa45da5cf62f7 SHA-1: ec636f28cf0a240c91fcd32ce064c40dd4499d67 SHA-256: 196cccccb40dd8cc980572bf95d82f652a315c89b7e5c115047654f7e1356204
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=android+listview+adapter+simple_list_item_2', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious URL and the link farm heuristic are sufficient indicators of malicious intent.

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=android+listview+adapter+simple_list_item_2
    • http://files.bjbeautifulthings.com/uploads/1/3/0/9/130969428/5b7da.pdf
    • http://ruxilubu.artbyvictoriajimenez.com/uploads/1/3/1/8/131871390/koxejupufima.pdf
    • http://files.kdgdistribution.com/uploads/1/3/2/6/132695306/togalasi_pivotinanulo.pdf
    • http://defidi.krististotalhorsemanship.com/uploads/1/3/1/3/131380429/gopidaxigilapitonama.pdf
    • http://vekuz.rajanibalaramfineart.com/uploads/1/3/0/7/130738697/ccd45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/advertising_and_sales_management_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/jefagikugudepumujajurek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2113/9096/files/70124554693.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/zixiremexezefap.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/sovedowinusuwinewekuxavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/beagleboard_x15_schematic.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/63683342366.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/ankle_sprain_exercises_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/marumekerevuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/1820/7911/files/poulin_wild_thing_chainsaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0438/5167/7856/files/woraxuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/g2._0_unpossible_erste_vorherige.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/massey_ferguson_135_repair_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007948.bin
407fe34e00d52b9bb9da88f3966387754eb8d023b090621b9a5172898fdfb117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7948 5196 bytes
font_01_sfnt_off00008af0.bin
f560953ae3e91874671c1128c9faa3365cfcd04d6c232d5e8ae04e2ab401f6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF0 12248 bytes
font_02_sfnt_off0000b2aa.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 4324 bytes

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