Malicious PDF — malware analysis report

Static analysis result for SHA-256 a030b283960965eb…

MALICIOUS

PDF

52.4 KB Created: 2020-08-19 02:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dfdc73dd5e90e79362763f51c0dec33 SHA-1: d94956ece38c3bdb1b8862589e856025c061fc6a SHA-256: a030b283960965eb140f2fe0ece76892de3cec27d1cbc20291fcd365ea6ef3b2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous seemingly benign links.

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=exampro+electric+circuits+answers
    • http://files.capecodsalties.org/uploads/1/3/1/3/131379060/a998ad5f808ade.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/pepakaxaguwonigitikiwadav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/ielts_speaking_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/benthic_organisms.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/html_table_to_jquery_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/lutenomosumulavisepete.pdf
    • https://cdn.shopify.com/s/files/1/0432/0165/9043/files/nepiw.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/fibadopamuxavasowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/89250528858.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/dulurisoxuwuwanawufevipog.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9539/files/53163136059.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/33889392962.pdf
    • https://cdn.shopify.com/s/files/1/0450/2369/0916/files/2020_kpss_vatandalk_video_ders_notlar_benim_hocam_yaynlar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/55566407353.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/biosensors_nanotechnology.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_off00008d17.bin
b47653cffc5c2aa2e2dd3fbf71b256c12f9be30e54491695fa75f07fdbdcbcad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D17 5196 bytes
font_01_sfnt_off00009ec4.bin
a673076e1f080c4236bfe53b4af68963b41ed48908aea5d309431e3fa5c40794
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC4 11224 bytes