Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8290e0fe4e9f57…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 06:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a188dd3b4cdc8beda1ff1285455f96 SHA-1: 3c25ef29479369289190ac92e4e808ac1fd7268f SHA-256: de8290e0fe4e9f5729f81908b32546040a2d488d53ecba692b8f7a8a0347732e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content or to distribute further malicious 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/wix?keyword=apprendre+jouer+flute+irlandaise
    • https://cdn.shopify.com/s/files/1/0432/3265/7568/files/xuxubukazipotifuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/64402022915.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/ocr_english_literature_examiners_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/fonapoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9121/files/blame_the_night_song_mp4.pdf
    • https://static.usrfiles.com/ugd/f0f215_18ee1e38813241998f8318f35d91f852.pdf
    • https://static.usrfiles.com/ugd/1a89c8_a9ab1b507c81474e9b197111de8afdda.pdf
    • https://static.usrfiles.com/ugd/a18aa6_26f41e8387d44b0e944ac05c01232bfb.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_4d126ce7cb4f4a0b9a47ad9fd1a4ac47.pdf
    • https://cdn.shopify.com/s/files/1/0434/3526/2104/files/46148602495.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/train_schedule_of_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/wilogabamosuwedo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/zikonevemalurezusilovoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/zujevakena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e2.bin
580e574f330bdb8b3b48b12f184d17aa7e8958c4daef4b1ee5b35958eafd1609
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 5100 bytes
font_01_sfnt_off00007349.bin
ac6eca61bf3552fb8ffadbf0752d9ae5640a4c7920320eedcfd512a660390685
pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 11940 bytes
font_02_sfnt_off000098bf.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x98BF 16204 bytes