Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a8064e81ba2d71…

MALICIOUS

PDF

44.1 KB Created: 2020-08-28 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd777aa63f4db871e3d5b5790390c815 SHA-1: ae702379443c55a7baac880d3d302c5f9c33a341 SHA-256: 83a8064e81ba2d71dfd80ae3994fff23a769d22df8a3db2ddd64703d237668d2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the title 'Que es la inercia en quimica' and references wkhtmltopdf, suggesting a lure document. The primary attack pattern involves luring users to malicious sites via a link farm.

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.ru/pify?keyword=que+es+la+inercia+en+quimica
    • http://lefosotax.sportpic.co.il/uploads/1/3/0/8/130874050/4209694.pdf
    • http://sefiz.triad-of-od.com/uploads/1/3/0/9/130969077/xosuji_zifafad_zupuruzemexux.pdf
    • http://files.rabbijonathanshulman.com/uploads/1/3/1/4/131437380/fibuvibozejufaj-medalikiferemi-novubuzuniwo.pdf
    • http://files.amsp.net/uploads/1/3/1/4/131483249/sipixafuviw_lozenu_kevefixino.pdf
    • http://files.winchestercarpetoutlet.com/uploads/1/3/1/4/131453674/436309.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/distinction_between_curriculum_and_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/32735827066.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/lomek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/vabugezasonigovamovos.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/trauma_abdominal_2020_atls.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/89652710982.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/82473483409.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/loroj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1361/0392/files/biphasic_sleep_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/12866556553.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/preparing_to_be_a_godly_wife.pdf
    • https://cdn.shopify.com/s/files/1/0437/4007/0042/files/blokus_game_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/pezugevifeji.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_off00006c50.bin
10f268a0003ea75003bab32bd3acf1af182f52dd48bb9c2d620e53e19eeb7409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 5132 bytes
font_01_sfnt_off00007da7.bin
06d81564bfefdbe2a3be283d52960edf89ebfa243b893a152033d576b3088759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA7 10980 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.