Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ed6e6c1e4e6cc5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-11 08:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fced593cfa6c43b32c28581374e8bf30 SHA-1: ee2f7f5f9d687059a24c8f57eb3ef0a7bf7c9ed7 SHA-256: 87ed6e6c1e4e6cc5084e2de0e6e9bc13591d3cfed8770326746d89281b9ecab2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this redirection. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic, aiming to attract users through search engines and then redirect them to malicious sites.

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=barthes+death+of+the+author+pdf
    • http://files.solightpro.com/uploads/1/3/1/4/131438038/1203699.pdf
    • http://pupiv.necelderscouncil.org/uploads/1/3/2/6/132681556/gamuwo-xubexutewur-rowivutubedun-divolutip.pdf
    • http://files.coronadonaples.com/uploads/1/3/0/7/130775725/274329.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/ligolaza.pdf
    • https://cdn.shopify.com/s/files/1/0448/8983/3639/files/regrouper_plusieurs_dans_un_seul_fichier.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/97329917035.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/attentional_capacity_test_act.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/dadazukuloluzakokajigul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6090/files/68546135351.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/gesepofitividekabopapukux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/jimolilofefetaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3529/files/sumidovobivagodob.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/mariregexutilodafis.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_off000067db.bin
f2ee93bdc394bc5df4e28ac1ad30af42ab28947f9662e39c83fd7d042e45595b
pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 5144 bytes
font_01_sfnt_off0000795a.bin
d9a9ab657181be05e3134c6f2fbe7fe4297f5d8f1529fe82f0529e54572a68ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x795A 10076 bytes