Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f6221fda61393…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 16:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2218b4d278053ce5d49b841b991a1707 SHA-1: f40e3170acfd1538ab3d139a77433912d12432eb SHA-256: f39f6221fda61393067fb861a6c97e1b2b6c0dfd3049869a26923850612c7fb9
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=asian+drama+tv+app+android', suggesting a lure to a malicious site. The presence of a link farm further supports the malicious intent of redirecting users.

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=asian+drama+tv+app+android
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/jatotamisomoten.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/70323231921.pdf
    • https://cdn.shopify.com/s/files/1/0440/1951/5557/files/fatuzoxeti.pdf
    • https://static.usrfiles.com/ugd/217d68_ce7e3a996bca4ce8acd0934ca2fb2a55.pdf
    • https://static.usrfiles.com/ugd/191a6d_5220ae9353304ded909a52ce968debc6.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/manual_brick_making_machine_construction_plans.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/fur_elise_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/60690888687.pdf
    • https://cdn.shopify.com/s/files/1/0447/9365/9543/files/99693774704.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2611/files/budisiridodozubaba.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/present_perfect_continuous_tense_examples.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_off000069a6.bin
0683ef82675e6f750f464be3273311258155a2a156cf0317aa1f6462e5a4cf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 4792 bytes
font_01_sfnt_off000079c1.bin
f401f293acb69dc0c4eb195931efb40b707fdba7618352e646893a0d2941f442
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 10196 bytes
font_02_sfnt_off00009cb3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB3 4324 bytes