Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11c66af868878c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 18:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2e2230c53c48adcf719f74f1087727 SHA-1: c3ca951848dcbf6f0f5cefe39c12695e83a55629 SHA-256: 8b11c66af868878c0be0c0da7eba52c51e2dbb493e0259a010576436ca805663
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, many of which point to a link farm designed to redirect users. One of the primary URLs, 'https://ttraff.com/pify?keyword=3d+pokemon+game+for+android+offline', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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=3d+pokemon+game+for+android+offline
    • https://static.usrfiles.com/ugd/b8c837_5cb81d1e40c9449fbe1879366c177ecd.pdf
    • https://static.usrfiles.com/ugd/f84671_d999c66ee45f4b33931634df5cb38829.pdf
    • https://static.usrfiles.com/ugd/63d3ad_21edd6dd6ca64a7a920a3ac2c61b3d83.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_98bbaeac857941cc933c7f72a3cd2fce.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1448/files/pugapirik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6570/4602/files/mixikezeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/bowflex_work_out_routines.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/coral_reef_animals_information.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/kolekititar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/nivivegajilejiruf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/34972139114.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/can_t_help_falling_in_love_piano_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/auxiliary_equation.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/ropogipozije.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/orthographic_to_isometric.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_off0000696d.bin
13dc5e0ba2aab8fe02f13b2bd3f7494ebb72fb342a469650906ca3633bf3a1a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x696D 5316 bytes
font_01_sfnt_off00007b76.bin
146c4229a74455ef75604ea44530f6d60b8df2e0c056e8d715902baaced0adc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B76 10292 bytes