Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fa7fb8f3b50afb…

MALICIOUS

PDF

42.4 KB Created: 2020-08-22 12:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e255bd3e7f644a5bfe8d672e47f1c78 SHA-1: f51c17a7abc123f78d51437c1e849591fd73ab40 SHA-256: f4fa7fb8f3b50afba30abed9c3e3b55ac42a04fdcce9fc311752aad2a6dc3305
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=photoshop+free+pc'. This URL is presented in a context suggesting a lure for free software, indicating a phishing or scam attempt. The presence of a large number of external PDF links, many hosted on Shopify, further supports the classification as a link farm designed to distribute malicious 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=photoshop+free+pc
    • http://fudin.graysinslade.com/uploads/1/3/0/9/130969592/aa30e9d6.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/vaminuxerowimotoladasunaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/yasin_sharif_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0441/3780/8024/files/xudasomirike.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/matrix_information_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/livro_budismo_para_leigos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/49787449874.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/2020_publication_15_circular_e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/monthly_household_budget_excel_spreadsheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2901/1359/files/pufuwid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/26541384621.pdf
    • https://cdn.shopify.com/s/files/1/0428/8842/9724/files/marathi_prem_kadambari_download.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_off0000693f.bin
261f5dcdc553b6244fdd3b39b67ae1e74ba63383e8b516c5ba62ce5078ddf43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x693F 4864 bytes
font_01_sfnt_off000079cb.bin
d85b1c2c8bf8425766edfdd481dc49495253cc9a87fbc758591967939a9979ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 10392 bytes