Malicious PDF — malware analysis report

Static analysis result for SHA-256 f812a4ebd3436086…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 15:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e063eed9eae9a3b27cbf736f288d439 SHA-1: 2a3840b332b178194d05ad32e92d06ee34f54cb1 SHA-256: f812a4ebd34360868655e69056d71cc949e8f2459d4d658d00a7ec26b9f92a49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains hosting other PDFs. The primary malicious link, 'https://ttraff.ru/pify?keyword=messenger+apk+old+version+free', is a known redirector to malicious infrastructure. The document body text also contains this URL, reinforcing the lure to download potentially malicious software. The ML classifier 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.ru/pify?keyword=messenger+apk+old+version+free
    • http://files.kingmanaussies.com/uploads/1/3/2/6/132682040/wamekok_rapisineni_fuxopijunorinu.pdf
    • http://files.wrbgroup.com.au/uploads/1/3/1/0/131070204/ponum.pdf
    • http://maravifo.sassyarabia.com/uploads/1/3/0/8/130874426/2567911.pdf
    • http://fonegaro.zoomintojune.com/uploads/1/3/0/7/130776260/2f896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/bejasired.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/bazigar_o_bazigar_new_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/odd_and_even_numbers_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/bartender_s_guide_certificate_of_proficiency.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2174/files/vumixitefudoterolojexuwu.pdf
    • https://cdn.shopify.com/s/files/1/0463/5118/8125/files/63204453802.pdf
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/fifirudoberimejifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/77804599724.pdf
    • https://cdn.shopify.com/s/files/1/0464/2662/0056/files/fubipoleruriwedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/zarew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/letatufobagijaxipudukep.pdf
    • https://cdn.shopify.com/s/files/1/0445/3344/8868/files/aims_and_objectives_of_dissolution_of_partnership_firm.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/moribitopevasudinonok.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/gibibagumer.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_off000061d4.bin
a4a038e617577e48f458d64cbb9dbaa1718518bc8e39d4b107ec09e0a1050de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D4 5340 bytes
font_01_sfnt_off00007419.bin
70c9c765c3e7f58d3e24735702cc0c758bafcf6f05cf2797cfe988eca50c3e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7419 10264 bytes

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