Malicious PDF — malware analysis report

Static analysis result for SHA-256 490b7cccb12dc6a3…

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 15:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3784e036a6778e3c6fa9fd811804e7d6 SHA-1: b12ca4847c3cfb21da580b5e0e12c39cdf701846 SHA-256: 490b7cccb12dc6a3a27e1b83709dbd88eb5ef9768c14c2ee186adfd8d73d4824
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm or SEO manipulation scheme, likely intended to drive traffic to malicious infrastructure.

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=bt+hub+5+manual
    • https://cdn.shopify.com/s/files/1/0432/8049/8848/files/benim_hocam_abt_matematik_video_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/avery_labels_5160_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/wondershare_video_converter_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/celtic_knot_designs.pdf
    • https://static.usrfiles.com/ugd/bd5c68_e4a40fc7ffc94bb1b819eaaa8e947719.pdf
    • https://static.usrfiles.com/ugd/63d3ad_72bf4920cb4e47ce86dc2a2971a2b19f.pdf
    • https://static.usrfiles.com/ugd/e3325f_7a2199bb7df347fd9bf6b61898e434f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd13bc5671c41d9bfb1df8e0549c6cc.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/8813596505.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/auto_technician_resume.pdf
    • https://cdn.shopify.com/s/files/1/0469/0742/4928/files/esl_reported_speech_advanced_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/fawamonuvadatenozikivimub.pdf
    • https://cdn.shopify.com/s/files/1/0438/1245/4560/files/70752380438.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_off00004dbc.bin
a4019cb4fc74a74ba7a7baef2f8cf44c97380d61999b3017eace0f0475048a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBC 4964 bytes
font_01_sfnt_off00005e7a.bin
1d604033e1f8c46cba17a0e6d62c3ea00c4a7c0856f5560cdd9ff71b4a5b9fb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 9784 bytes