Malicious PDF — malware analysis report

Static analysis result for SHA-256 b537ffef0c557257…

MALICIOUS

PDF

38.3 KB Created: 2020-08-19 01:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d572458caf55f4d25b738d15d3af5c57 SHA-1: 3fa92d1798a3314399e32ab4972822d8bac3d8a5 SHA-256: b537ffef0c5572576f621b6c317c9fc9f4b5c399fb8498f7e62713f25ce4ef43
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a "Deer head cutout template" lure in its document body, which is highly suspicious given the embedded links. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary link leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, many pointing to Shopify, likely to obscure the malicious redirector. No scripts were extracted, but the document body itself contains the malicious URL, indicating a social engineering attack.

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.ru/pify?keyword=deer+head+cutout+template
    • http://rumuzu.nkyyoungmarines.com/uploads/1/3/1/4/131406390/bamabuwudesex-dafuxowuwegowa-pofekibevutak-damogutiwugimu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/14552552912.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/nejir.pdf
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/english_grammar_articles_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/aristoteles_gran_etica.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/pezemidovigififo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/braveheart_theme_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/sizufafozabokabupekesok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/bioshock_rapture_ita_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1712/5544/files/togolinuratipikokidafav.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/map_projections_in_gis.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_off00005990.bin
8f76bfa98a29586e62f0fbc08f05d23e97fb386787b43fbd932827eb0a471c0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5990 5136 bytes
font_01_sfnt_off00006adc.bin
f9b4b52a847b59447f623a3abc11f1ba0366cf27b3a052cf090b36cb5ea0912d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADC 9920 bytes