Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead3c2a4b837cf2f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 22:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc84ea48488b2ca0e51181287fcdefca SHA-1: 18b3d8787b2a9fcb08c5cedbe750d8df5fd70e57 SHA-256: ead3c2a4b837cf2f5dc6d2d18daf4ebbf7520b3d4c3a26a679ebe34be5aeb20f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm. One of these links, https://ttraff.ru/pify?keyword=indica%25C3%25A7%25C3%25B5es+de+cateterismo+card%25C3%25ADaco+pdf, points to known malicious redirector infrastructure. The document body itself is heavily obfuscated and contains similar URLs, suggesting the primary purpose is to lure users to external, potentially malicious, sites.

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=indica%25C3%25A7%25C3%25B5es+de+cateterismo+card%25C3%25ADaco+pdf
    • http://voziwoxi.kinderdancemetrostl.com/uploads/1/3/0/8/130814328/6302927.pdf
    • http://files.manitobalivinghistory.com/uploads/1/3/0/7/130776484/4903728.pdf
    • http://texela.docegg.com/uploads/1/3/0/7/130776208/bibewulazasafamozopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/stock_market_trading_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/56940823660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/rumakid.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7719/files/43846306515.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/11349965849.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0737/files/88414224441.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/momepamekosunatus.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/29793781464.pdf
    • https://cdn.shopify.com/s/files/1/0438/5426/6533/files/73008574763.pdf
    • https://cdn.shopify.com/s/files/1/0435/1180/8155/files/62221924120.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zalobam.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_off000060dd.bin
3050fb61502ca12df287c199066a367dcdf94e1db1271c7c01eee4b2cb07604c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DD 5660 bytes
font_01_sfnt_off0000737d.bin
63764b3bf7899bf6510d70ca20aae3488658c3265517450bd38ecb5beb767f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 12112 bytes