Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12ea0e4e707d2b0…

MALICIOUS

PDF

73.3 KB Created: 2020-08-09 19:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98829bf8b27c5dcf7eb5228c45893a4 SHA-1: 51ade4692e25e64cec4e218dd4f2914b2ed59edf SHA-256: c12ea0e4e707d2b0dafc16a789176e391140b835706e1dbe96ca9f41894becd6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to phishing sites or malware downloads. No scripts were extracted, limiting the analysis of direct payload execution.

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=catalog+schneider+pdf
    • http://roputujur.ligonierhighlandgames.org/uploads/1/3/0/7/130775350/c397f9368401a71.pdf
    • http://files.pro-can.org/uploads/1/3/0/7/130738821/gefimi_ridedizoxog.pdf
    • http://files.garyscollision.com/uploads/1/3/0/7/130738956/33efbba7.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/98509708743.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/23204758948.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/vopopebuzuduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/el_minimalismo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/where_are_borderlands_2_save_files.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/ejemplo_de_calaveras_literarias.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/53289912599.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/68000462639.pdf
    • https://cdn.shopify.com/s/files/1/0435/9595/6386/files/39675994901.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_off0000d65d.bin
d2c7bcadf64c979b26a50d8ded46feb87b2bd9c6978cd9db1db66f9fe4adef97
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5320 bytes
font_01_sfnt_off0000e869.bin
b5b1b693e3bb1eeec47359df398c5ac9eddeaec10240e8ce3131c8897868f220
pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 15600 bytes