Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aa079c5ce64cf2…

MALICIOUS

PDF

45.8 KB Created: 2020-08-22 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d26a056dbf6d4d45b60a3fc5fd9a8523 SHA-1: 218c394fc59313abb29c2ab27322aaaecc232ac2 SHA-256: 76aa079c5ce64cf205f78d55db0f9a42576f460b988e86cd784585033d754bfe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites.

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=lipid+profile+test+calculation+pdf
    • http://files.smporterauthor.co.uk/uploads/1/3/0/7/130775282/kapebelonaxor.pdf
    • http://files.awananet.org/uploads/1/3/1/3/131378816/bowebapemokejef-xefilawijep-wudab.pdf
    • http://files.believethebestisyettocome.com/uploads/1/3/1/3/131378990/3534553.pdf
    • http://files.probopolo.com/uploads/1/3/0/7/130740165/toguletov.pdf
    • http://files.edenlankaholidaytours.com/uploads/1/3/0/7/130775257/963f31a.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/28690905937.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/fesuzumuvulux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/37972409796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/nidofikugomatixekov.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/12845412006.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59677855830.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/xevutelewanilobirojew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/28911139108.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3745/files/calcutta_university_migration_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/vivimaje.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/15236437624.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_off00006f0d.bin
4c4e7813b4627009181f5926d3f178922991bc574d172787c6b3a09be910d0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 5092 bytes
font_01_sfnt_off0000806c.bin
c3842051c89760bbc45528d3d8a5101bedf825f273f7d39f5e5935eef428fcab
pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 13128 bytes