Malicious PDF — malware analysis report

Static analysis result for SHA-256 33616dd886692a69…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 03:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1f30c4d93b1fc163eaa47b08d61d74 SHA-1: 8c299556bef0d90caffd13f8048c05375ed86271 SHA-256: 33616dd886692a6994151e556dba55f4ba0a9a6d821497b89239e61b578f3d6a
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wix?keyword=sharp+xe-a207+service+manual', is flagged as a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with many links pointing to external PDF files, likely for SEO manipulation or to distribute further malicious content.

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/wix?keyword=sharp+xe-a207+service+manual
    • https://cdn.shopify.com/s/files/1/0431/0525/5586/files/bell_palsy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/milodimoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/passive_voice_all_tenses_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/27535233155.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6c7368f94247e494fa07c04dd2c076.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed579ad385854d5c88d434ac03084648.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe841c115bfb49aa8d8d46418d8f5705.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc70e266c9364a3c9d1fcc36c4b3cfff.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/15208020207.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/tratamiento_nutricional_para_anorexia_nerviosa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f233e7da2c0f4303a7fefed87be8e8ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa7970f8d3f5486ba68204eadbf8bc0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e3139bcce8430f922dac828fd2f76d.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_off0000644b.bin
0609ac5e87ef4b465fb944f7b4ea9ea583ced22ec30fced6e3ea0ea980c0e472
pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 5480 bytes
font_01_sfnt_off000076cb.bin
3703a137778dd89ad3056110d5578767a5ac643f9c3b81a8d5556759a37c74b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x76CB 10524 bytes
font_02_sfnt_off00009a9a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9A 4324 bytes