Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b7314fbb86e887…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 00:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23bf616be2e736096a85f2fa5fb8c8a SHA-1: 55a3b238afae014f1ecb637b4af614b32321fc41 SHA-256: c8b7314fbb86e887e4ae36d1d89cb14492b275bf9ecb36da80c67b718d8254e4
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/pify?keyword=falaknuma+das+arerey+manasa+video+song'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary mechanism for directing users to 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.cc/pify?keyword=falaknuma+das+arerey+manasa+video+song
    • http://files.vanndukeandsammygotjokes.com/uploads/1/3/2/3/132303013/9763178.pdf
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/16962664785.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/ios_font_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/17137257979.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/85887391816.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7221/files/2_digit_subtraction_with_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/92683991023.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/16642344403.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8985/files/26647792278.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/fasijewopozenonore.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_off0000571b.bin
2c5d1ab91bf316b1634ff280806b3a2d5c14fca6e81a448766dbc191fc4d1232
pdf-font-stream PDF embedded font (sfnt) at offset 0x571B 5128 bytes
font_01_sfnt_off00006878.bin
0215fbb68c295d817501a0a3ea2636638bbd99488fc39d21c6e7081a9acc72aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 10244 bytes
font_02_sfnt_off00008b83.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 4324 bytes