Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16f71d3f55b633…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 18:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcead47af470acb49912bdf517cef61a SHA-1: 20b97374f0f86f489c9758d2949c421dbc6c1eb2 SHA-256: af16f71d3f55b633ff4a7c7f6651788f255684ef9145ba91c3444171f2dcee32
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of an SEO link farm, with numerous external PDF links. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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.com/pify?keyword=constant+voltage+transformer+function
    • http://pafevenur.donniemasters.com/uploads/1/3/1/4/131437296/memajajunag_sadafe.pdf
    • http://wofikere.neighbourhoodnoms.com/uploads/1/3/1/4/131408899/21336fa.pdf
    • http://files.bonejourdoggiebandb.com/uploads/1/3/1/8/131856232/2911487.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/6038323989.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/58677160022.pdf
    • https://cdn.shopify.com/s/files/1/0433/1254/5950/files/99183318848.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/megivodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/cadette_night_owl_badge_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/loxorobegixepajoxumuzof.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/sutosam.pdf
    • https://cdn.shopify.com/s/files/1/0435/8252/1512/files/fabokivagojanuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/88613276605.pdf
    • https://cdn.shopify.com/s/files/1/0443/0761/1804/files/it-_204-_ll.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/48956400769.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_off00006152.bin
967af2566ddafa4d67a4e7668911d16e0f4b04f6ee562fcb243c94b74167950c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5168 bytes
font_01_sfnt_off000072dc.bin
78a9285095d6eed6f4ba54097c514e9e0b19edeed24e2f9bbfb8e82d50e31b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x72DC 10020 bytes