Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1c99fcc669438c…

MALICIOUS

PDF

32.5 KB Created: 2020-08-22 11:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f370422c482c049eb4586cda6f52b813 SHA-1: 07141262fdf72f6aefe43b5d818a19d4bc2e0940 SHA-256: 7e1c99fcc669438c17a4d2004ea85ddefd3571df03b4ad9f2a4c390a089783ee
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection scheme. The presence of a link farm further supports the malicious intent of directing users to external, potentially harmful, 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.com/pify?keyword=co2+welding+machine+specification+pdf
    • http://files.shirleyanneceramics.com/uploads/1/3/1/4/131438501/gerenopij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7151/2480/files/25945463116.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/punixulomifobel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2391/6443/files/define_corporate_social_responsibility.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/joxupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22700630349.pdf
    • https://cdn.shopify.com/s/files/1/0437/0523/7657/files/kapaxojok.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/85445693677.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/jorozikale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorirazapevimixawas.pdf
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/lines_slopes_and_equations_revisited_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/mirisuga.pdf
    • https://cdn.shopify.com/s/files/1/0448/5352/6690/files/ornamental_fish_farming_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3522/1403/files/kowaziwojofawi.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_off0000409f.bin
7818b53cb0db6925101b0456b17dd3d034363cc8127cca8a89319f787e6abcf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x409F 5600 bytes
font_01_sfnt_off00005399.bin
d6b327142345df4885d88cf404e4f1e00935f8c8b0442a92e31562c709cec67d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5399 9868 bytes