Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23a53b2292fc56a…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 01:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3d9ae1a8fe8874ef7ee0a65624f940 SHA-1: 3053cf57701dd87bbc372c429ddc934124b32b88 SHA-256: a23a53b2292fc56ac485315f6538223f458d405d628766c390d425f681dd6f99
154 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.com, which is designed to lure users into clicking through to potentially harmful content. The document body, though heavily obfuscated, contains the same URL and text related to sheet music, suggesting a social engineering pretext. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

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=simply+having+a+wonderful+christmas+time+sheet+music+pdf
    • http://files.mcadoos.ca/uploads/1/3/1/4/131455463/80e2b45281.pdf
    • http://files.mosaiqc.eu/uploads/1/3/0/7/130775715/xoxuwibenomaxilow.pdf
    • http://files.imallgifts.com/uploads/1/3/0/7/130739699/lasoruxifibivilogub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1115/files/dieta_cetognica_cardpio.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/vebususejaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/1998_dodge_ram_1500_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/fanuxijadibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/18774483356.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/the_script_hall_of_fame_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/25905552698.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/xopufagamupofesugisopim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/57678295703.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_off00005f14.bin
23fe169327914a9cac731e2aaa598677098934e57f49cde2542ebc377a957fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 5928 bytes
font_01_sfnt_off0000732f.bin
843b093239397a7caf0ae031afb83517b5f631e365f3e1eda32498c3a06c0540
pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 10196 bytes