Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d15ec4b213f4742…

MALICIOUS

PDF

33.8 KB Created: 2020-08-13 21:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218ef143b302209f6dc6c64c48356a2b SHA-1: ed02dd0692fb2f5bf4b345fb1b6fe8ec453b12ee SHA-256: 7d15ec4b213f47426e65d4af4f7d7cb1d0eb5591ef75c910061677229073d58b
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and a reference to 'hd video converter apk free', suggesting a lure for users to download potentially malicious software. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve SEO for malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=hd+video+converter+apk+free
    • http://files.multividrios.com/uploads/1/3/0/7/130739177/befarekumogebij.pdf
    • http://files.strongholdinteriors.com/uploads/1/3/1/8/131871659/5258637.pdf
    • http://files.joerussellphotos.com/uploads/1/3/0/8/130873876/8feee5b.pdf
    • http://files.yogaforgrownups.com/uploads/1/3/1/0/131069890/voripi_tezas_paremo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/dububilubate.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/velitaxixojizuze.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/accounting_related_terms.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/hospital_administration_bm_sakharkar.pdf
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/17033027948.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2312/files/nivalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/tomoni.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/timewone.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/algebra_questions_year_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/49225195402.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_off00004711.bin
156d6c3963cd898034a084851c6fb776ea9d8c5c8e0d7acc1d80c244bd3f9178
pdf-font-stream PDF embedded font (sfnt) at offset 0x4711 5024 bytes
font_01_sfnt_off00005839.bin
13202cd853dacc1074f1bc4a8bd38af1ea61fb2eaf7267313958711a73b1232c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5839 10136 bytes