Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dffaff6ee503cd…

MALICIOUS

PDF

39.5 KB Created: 2020-08-21 17:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a6b14baf5c79794ebee930fbfc8cd2 SHA-1: f73e332a020276407a8594226eac9550aadfd07b SHA-256: 85dffaff6ee503cde62a9192c0523ee8029c14a762bc55439a276e813a82a65f
152 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to the malicious redirector 'https://ttraff.com/pify?keyword=autobiography+outline+template+pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine rankings or distribute malicious content. 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.com/pify?keyword=autobiography+outline+template+pdf
    • http://files.sfpathletics.com/uploads/1/3/1/3/131380305/8623488.pdf
    • http://vawovuvax.writedownmemorylane.com/uploads/1/3/0/7/130740514/megiguwu_xetovunorolov_taxidinoguju_dojuronemezagej.pdf
    • http://files.wellesleyhslibrary.com/uploads/1/3/1/4/131483281/lukekir.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/annals_of_microbiology_author_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/5605468515.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/logical_reasoning_aptitude_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/kogovisikuginewegawij.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/lebimiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5520/8858/files/gangsta_granny_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0510/files/mujexezi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/wesazulajulokali.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/ngl_meaning_text.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/completely_uninstall_mysql.pdf
    • https://cdn.shopify.com/s/files/1/0434/1134/1479/files/brat_diet_list.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_off00005ddc.bin
9b1ffbec87b4ac0eda840d5b7cfbed77e0555f360752379fca8b8ae22471c4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDC 5508 bytes
font_01_sfnt_off00007070.bin
85d6cea6d78b59726d6e07bb6ec0a5b891b36f1918f476ad236111324a3f9e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x7070 9692 bytes