Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bf64d62c9e81ed…

MALICIOUS

PDF

48.8 KB Created: 2020-08-21 10:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d166dc86466e22f22df4b4f393210eaf SHA-1: 3ff9c7e1d8a9dc5ec5e713b17b016db6e3e3fc78 SHA-256: a8bf64d62c9e81ed24309ff95384fdc7ec14450dd2c71a1d9956be7ebe737732
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=alarmy+paid+apk+free'. This URL is presented within the document body, alongside numerous other links to PDF files hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=alarmy+paid+apk+free
    • http://files.myparkconnect.com/uploads/1/3/1/4/131407144/5457578.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4567/files/kuby_immunology_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/didegiwibugelove.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/56318664344.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/towirilojosibizuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/zowam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/html_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0440/2062/9654/files/antidiabetic_activity.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/nixututij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/geology_of_anambra_basin.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/timer_for_2_min.pdf
    • https://cdn.shopify.com/s/files/1/0440/1607/4902/files/pibagatamelagofatafixo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dcf.bin
ac6edd01195992b2c41c67e22319b69a27d42a89cd8906b416fcd32ee63a1f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCF 5164 bytes
font_01_sfnt_off00006f4d.bin
c858df80e9eda258b9315ea3cbd12405f70d652c1f75e838319c15eaab0fbd31
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 2144 bytes
font_02_sfnt_off0000792a.bin
cc7e1063a2b6f992fc5774fff88bdce5ed756b629183d0c6f303908171e92554
pdf-font-stream PDF embedded font (sfnt) at offset 0x792A 10884 bytes
font_03_sfnt_off00009e98.bin
5ae67c8435f95fe8f97e189614720ff276b8bb49ed22e08e82763308cb0f800b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E98 16300 bytes