Malicious PDF — malware analysis report

Static analysis result for SHA-256 4245fd689281c2dd…

MALICIOUS

PDF

35.8 KB Created: 2020-08-29 03:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2817efabe21db3a0da6919713ede206a SHA-1: 30a1d9b1a259d0a095a0eb9d4c89544abc695a20 SHA-256: 4245fd689281c2dd585e4644b42ddfa6b3f666a2604c401e682d2dc3f032ffe8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=inji+idupazhagi+remix+song+download'. This URL is presented within the document body, disguised as a song download, indicating a social engineering lure. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm used to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=inji+idupazhagi+remix+song+download
    • https://static.usrfiles.com/ugd/b8c837_b74dfd45a8ad4ce9b38ab136b8467e9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc4811e10edb45acbd096aa9428404c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a422e836c42a4d85b8a812df5422cc6d.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/vejiwizedovoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/8661082467.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0652/files/deadly_pressure_points_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/zidagobutagonavapuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/risk_management_and_contingency_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/40296790333.pdf
    • https://cdn.shopify.com/s/files/1/0434/4404/3943/files/zekubazikopax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/pewakemominevuwaba.pdf
    • https://static.usrfiles.com/ugd/b8c837_3747a899bcf04340a272ee1d411db89a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7985001c949a49b68089b4e81d4ed02d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6946d38991dd4992b14f681500e3a028.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_off00004d01.bin
3f2b878052b4a26028742847916da2d6c13895117882043eaf1b9a055250bca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D01 5596 bytes
font_01_sfnt_off00005ff9.bin
f8c15972c12a4f9460c374165e1765aa6e59af5cfb20c69371709f2e5a5f071f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 10172 bytes