Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62ce4cac617c6e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 16:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdcff7cef3dd903cb2d8c943f532b726 SHA-1: f9638e81fb9e5ba1139f918f26519ba3f49990d7 SHA-256: cf62ce4cac617c6ed395ff28a1223568e3bb3c130c07c05d4f0b4106a30f9dbe
152 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, specifically `https://ttraff.cc/pify?keyword=asus+zenfone+5q+android+p+update`. This link is presented as an update for a mobile device, aiming to trick the user into clicking it. The document also features a link farm, with many links pointing to Shopify-hosted PDFs, suggesting a broader campaign. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=asus+zenfone+5q+android+p+update
    • http://files.mscalbanyga.com/uploads/1/3/1/1/131163684/c9d06e6a30f2e.pdf
    • http://files.chadwickandigor.com/uploads/1/3/2/7/132740836/3767242.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/government_budgeting_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/93768114051.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/zipedijejuwajirutaxolibov.pdf
    • https://cdn.shopify.com/s/files/1/0437/3233/6792/files/vedomujexipezajulavizofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/incident_report_sample_letter_doc.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/13131504503.pdf
    • https://cdn.shopify.com/s/files/1/0432/2086/1092/files/sevtech_ages_server_setup.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/40078553957.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/how_to_delete_multiple_messages_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0435/4850/8311/files/boolean_algebra_examples.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_off00005eae.bin
89fa3552b9d1b7544f552c769ea774bdbc0679fab724a75b7954350c39695e60
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 5176 bytes
font_01_sfnt_off0000705d.bin
f0a4fa6fe24a2326e45882fe3e7d81b4f530959ef3aa0dd85928cdead34364a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x705D 10296 bytes
font_02_sfnt_off00009390.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9390 4324 bytes