Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8a61b3e388494b…

MALICIOUS

PDF

52.5 KB Created: 2020-08-21 20:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a797db7e7ae83ddbde2d3db5e9499c09 SHA-1: 41dc45167204b951301098f621ece42523e8b1ec SHA-256: 8b8a61b3e388494b813268ffff27934e9ad247dbfcc344ea05a85887ccb7da34
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a mass external PDF link farm. One of these links, https://ttraff.ru/pify?keyword=apertura+ad10+manual, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=apertura+ad10+manual
    • http://kabak.chrisball-student.com/uploads/1/3/1/0/131070894/1672640.pdf
    • http://files.joeldguy.com/uploads/1/3/0/9/130968943/kivemutadizuxupizoz.pdf
    • http://files.trevelle.com/uploads/1/3/2/6/132682235/4880750.pdf
    • http://files.frontiermosaic.com/uploads/1/3/1/4/131453486/sitajog-munolez-kuzonoxuri.pdf
    • http://jokepal.dancewithmweyne.org/uploads/1/3/0/8/130874633/2094108.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/rorizanoxanoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/27411388785.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/hazardous_area_classification_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3345/9879/files/encephalitis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/mindless_behavior_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/vabinoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/asynchronous_state_machine.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/birthday_songs_free_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/sotivemoruzigeferitin.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/jupolinerebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.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_off00008581.bin
f7637325fcb4d292b1a63a3b4ceda3229cc739e7927ba9eb0aae6fbe52b6b444
pdf-font-stream PDF embedded font (sfnt) at offset 0x8581 2020 bytes
font_01_sfnt_off00008eef.bin
61e469ea41de9ed1109658a7667d784e0794b28735fadce5257c835385bfd5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 5112 bytes
font_02_sfnt_off0000a03d.bin
dd3bd99289ef396511a859a544c38d34fcab5f805d7fec41562bd14e150df53f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA03D 10132 bytes