Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3daf8631b4601e7…

MALICIOUS

PDF

32.9 KB Created: 2020-08-26 11:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef58a91ec29c2f3941634560ecf9b5f SHA-1: b8691514ffddd4bd7458e77c965a4544916b1909 SHA-256: d3daf8631b4601e7604a15c8cb8a0c2b129149b66005dfd0bc1103b90cb2b030
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, also contains this URL. The presence of numerous other links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful content.

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=bbc+radio+4+podcasts+to
    • http://tamire.myhillchurch.com/uploads/1/3/2/7/132740763/vopewo-rebal-betuzolov.pdf
    • https://cdn.shopify.com/s/files/1/0437/4675/4714/files/cuales_son_las_causas_del_bullying.pdf
    • https://cdn.shopify.com/s/files/1/0464/5240/8488/files/urine_culture_sensitivity_report.pdf
    • https://cdn.shopify.com/s/files/1/0452/3671/5677/files/41999390555.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/nezeviza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8421/files/csea_hawaii_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/jotota.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/kerbal_mun_lander.pdf
    • https://cdn.shopify.com/s/files/1/0437/5383/2609/files/delhi_bus_route_map.pdf
    • https://cdn.shopify.com/s/files/1/0440/6460/4310/files/gasiladonog.pdf
    • https://cdn.shopify.com/s/files/1/0437/5327/5546/files/chronicles_of_crime_tutorial_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/36075099585.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/baofeng_uv-_5r_nz_manual.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_off0000454f.bin
c3faa41165c6e5cc370cf9476c75fc34cdc7b0c1cfb9fe1589821d19ae22c117
pdf-font-stream PDF embedded font (sfnt) at offset 0x454F 5312 bytes
font_01_sfnt_off00005763.bin
31ffba3e96dbfdf99976577cacc251bcde00cc5787c6dac903ffb09d5c1e930e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5763 9288 bytes