Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3795d2027fd7bbc…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 13:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecebe72bfd9d63e3b5380579f1bdf466 SHA-1: 0511d2176be81bc3c05a0e3f200774b08b669b40 SHA-256: f3795d2027fd7bbcf4b603fba8afd09357fbb5695e0299c9d54be5ff4a9b6623
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download for 'Tor browser for linux 32 bit'. This link, https://ttraff.cc/pify?keyword=tor+browser+for+linux+32+bit, leads to known malicious infrastructure. The document also hosts a large number of external PDF links, many of which point to Shopify domains, suggesting a link farm for SEO manipulation or to obscure the ultimate destination. The ML classifier 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.cc/pify?keyword=tor+browser+for+linux+32+bit
    • http://files.annlanegateslegacy.com/uploads/1/3/2/3/132302928/leribanekut-xolijekatak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/68306031043.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/gebutefizafid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/tic_tac_toe_program_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/nuvewina.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/luluvajuxaxozawetobidut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/fojisidololuzarax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5908/files/ielts_writing_task_1_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/river_phoenix_casket.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/15193793921.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/38846069008.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/everybody_move_your_body.pdf
    • https://cdn.shopify.com/s/files/1/0464/1348/0104/files/smackdown_here_comes_the_pain_ps2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.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_off00006297.bin
1602159e82d2ebc93dfb594e66480933be2aa02dd7fbc6ce5b98d7ff16349230
pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 5096 bytes
font_01_sfnt_off00007417.bin
9613e320ba2cf740a16685c637930bb70ce031db9cbfab98d9a249f117d70ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 10444 bytes