Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f9fd00c454cc2f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-02 03:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf5d3447dd46b229a6185024bd777e7 SHA-1: 81a38e7bcf6f2693756d77dbc102ca20b3456152 SHA-256: 94f9fd00c454cc2fb310bbaf16ccf144f17e2f2482501b32ad5c8c4135db8d0e
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Samsung ssd magician' and a URL that appears to be part of a link farm designed to attract traffic. The presence of numerous PDF links and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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/pify?keyword=samsung+ssd+magician
    • http://files.cbconwy.com/uploads/1/3/0/7/130775249/d23ee4a5f778c0a.pdf
    • http://files.cristinascuisine.com/uploads/1/3/1/6/131637850/7711300.pdf
    • http://files.prehabwa.com.au/uploads/1/3/0/7/130775400/9795544.pdf
    • http://files.anekaingold.com/uploads/1/3/0/7/130739268/7580511.pdf
    • http://files.mariemedhair.com/uploads/1/3/1/4/131407435/raxirusafa_watujuvipos_vagopebonefeni_getoxikiletozes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/19444826539.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/12621965181.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/11347146280.pdf
    • https://cdn.shopify.com/s/files/1/0435/6508/8936/files/tiripuvipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/86650535650.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/38000277646.pdf
    • https://cdn.shopify.com/s/files/1/0449/9701/7768/files/salary_history_letters.pdf
    • https://cdn.shopify.com/s/files/1/0428/4550/3655/files/gurijuvoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/lejofefekuzoxawodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/77788454817.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_off0000612e.bin
a98d12fd87417c7a114995457cc98ea2247b15d2349e709a78245638dd668b41
pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 5236 bytes
font_01_sfnt_off000072ec.bin
326d95f6ab62429a935d7b54832e71ebe58d320e29505800f84a58868bf3b46a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 18184 bytes