Malicious PDF — malware analysis report

Static analysis result for SHA-256 978279c087050ebe…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 03:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d181cc1681df858b58f201ef33d2f3 SHA-1: 2169f3c567228547c9bc03543e4d03744de5c6fe SHA-256: 978279c087050ebec9f0fad81446fc78834248b1c184b492d1ac9ef776c09c7f
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 links, identified as a PDF link farm. One of these links redirects to a known malicious URL, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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=web+browser+app++for+android
    • http://xomizobet.pjpexotics.co.nz/uploads/1/3/2/7/132740405/4181808.pdf
    • http://files.battlecreekendo.com/uploads/1/3/0/9/130969332/592017.pdf
    • http://files.antiquestauranga.co.nz/uploads/1/3/1/0/131070146/93e045.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/tinkers_construct_best_tools.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0999/files/zelujefupes.pdf
    • https://cdn.shopify.com/s/files/1/0445/5848/3620/files/difference_between_stack_and_queue.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/42533485896.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/medakelub.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/rumaremizunavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/84770167159.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/davosefelibawu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2401/3722/files/lifamosixanefozivefaj.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_off0000699b.bin
46248fbdeee9cd02518d8eb2af8bc7fad3c7c162d1f2cc93d34e27f4ddde985a
pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 5248 bytes
font_01_sfnt_off00007b9a.bin
f0404dbd452c4107ecd3472b36ab5dd1c5d710ab813931c4ff9683616e87be95
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9A 10856 bytes