Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecd8af95bf86be0…

MALICIOUS

PDF

51.4 KB Created: 2020-09-01 12:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1764ab059c9e50a2e9dd7f301236360e SHA-1: 78b322fa2b06b3d04b74218ce970e083c53c4c57 SHA-256: 7ecd8af95bf86be0cd8e556fae982249e8642b7904462db2b98bfb4d58c5c31a
152 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains fragments suggesting a lure related to 'Android alarm setrepeating'. The presence of a malicious redirector and the link farm heuristic indicate a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=android+alarm+setrepeating
    • https://cdn.shopify.com/s/files/1/0440/0676/8798/files/71082598317.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/vexaduserufedijokovamomu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/cara_membuat_cv_lamaran.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/boom_beto_munodonhedza_musika.pdf
    • https://static.usrfiles.com/ugd/764aaa_1fdc3697427e4e39990c11be05ed41ee.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/90528194845.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/29981420283.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/63179160193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/53894834720.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8447/files/66239999725.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/72749976114.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_off00008d08.bin
854d78b74f95cc900c93885615032422e13959db504a158528a6cdd095b34836
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D08 5268 bytes
font_01_sfnt_off00009edc.bin
6b60012678506a73b07b66af0c5aeacacae1689d3702b4293ea656cf0c6c3565
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDC 10116 bytes