Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f324e2715d4e6ea…

MALICIOUS

PDF

56.7 KB Created: 2020-08-22 09:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3027b9256147795e2e06e098ba51813c SHA-1: 0b6455ab64b7293a5d62fe870bb2dfc7f1f63a77 SHA-256: 9f324e2715d4e6eaf1c2291211397fa39b6dd6f9d10a32a873dc25fb71196460
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=android+bitmap+width+pixels', which is a primary indicator of malicious intent. The presence of numerous other PDF links, many hosted on shopify.com, suggests a link farm or a method to disguise the malicious redirector.

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=android+bitmap+width+pixels
    • http://files.ourcountryproperty.com/uploads/1/3/0/8/130874278/3f194e24d4b.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/all_basic_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/66158678558.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/behavioral_design_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/modul_akuntansi_sektor_publik.pdf
    • https://cdn.shopify.com/s/files/1/0452/5889/9618/files/33663463597.pdf
    • https://cdn.shopify.com/s/files/1/0435/6790/6977/files/arcaea_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/92935651213.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/91679251418.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/acids_and_bases_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0454/7362/8326/files/internet_explorer_for_mac_2017_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/bureguwawez.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/accident_reporting_at_work_uk.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_off00009519.bin
bf19a6894817c4d225c5ea36ec46a4e9632810a3fac077a8debcefdc56c2aa60
pdf-font-stream PDF embedded font (sfnt) at offset 0x9519 5488 bytes
font_01_sfnt_off0000a79d.bin
d33c0d8c5272b58f621aac043040feec9baf1c1f4b46d50750a98e3f77e2d5e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA79D 14412 bytes