Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6901ca25d5b13e2…

MALICIOUS

PDF

122.4 KB Created: 2020-08-08 16:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c3cd45f6e4db17e5faaac5441bf32b SHA-1: 9b8eb380a2c395d8267c26ad2034fc35174bdef4 SHA-256: f6901ca25d5b13e227307e62674a028f373c3f0b4b1bc218af631362ba108ac6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=atletismo+saltos+pdf), and another identified a large external PDF link farm. These findings suggest the document's primary purpose is to lure users into clicking malicious links, likely leading to phishing pages or malware downloads.

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=atletismo+saltos+pdf
    • http://galidiba.smokymountaincathouse.com/uploads/1/3/1/3/131381078/jimomapuledufo.pdf
    • http://files.norwichmonument.com/uploads/1/3/1/3/131398278/2074002.pdf
    • http://files.skydivetofino.ca/uploads/1/3/1/1/131163867/veziretej.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/92893005048.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/bepelupev.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/ashrae_handbook_of_fundamentals_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/wovosefudovukavike.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/24736283613.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/questes_princpios_da_administrao_pblica.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/96712859010.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/pdf_to_word_converter_offline_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/dapejewebit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/26986697258.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/mizobawave.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_off0001a431.bin
89a51c3f1505e2efb779b289e07405115f0d3dfd7c8d2259e5b49c41197019f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A431 5080 bytes
font_01_sfnt_off0001b56a.bin
78d07d7a5908f9af7306fbf79096eaababf076dd70440c4ba6cb7d50f57b716b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B56A 12384 bytes