Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48f40e9841d7467…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 12:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb443cd90c56ecc7485e0efb6c7e0a03 SHA-1: 098467013c27471b61df37dd2d65b9050903b3b9 SHA-256: e48f40e9841d7467bd5d30b26b4a6a41bf354c7d12303667bac41e62d785c181
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=bearshare+apk+free'. This URL is presented within the document body, suggesting a social engineering lure to trick users into downloading a file. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=bearshare+apk+free
    • http://pagogiwag.zionweekdayministries.com/uploads/1/3/0/7/130738870/novifaxeten.pdf
    • http://zefur.louisemartinart.com/uploads/1/3/1/3/131384611/b62408a0714.pdf
    • http://files.entertainmententerprises.net/uploads/1/3/0/7/130775292/4939448.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/97038546092.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/jeviduxoribawafagepexak.pdf
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/71182977561.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/veranebew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4229/files/lemodagajavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/metijumadijavate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/marriage_resume_format_in_word_file.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/lakiwowikuzumesolokanusi.pdf
    • https://cdn.shopify.com/s/files/1/0461/9501/5831/files/openshot_video_editor_32_bit_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4149/files/canon_in_d_piano_sheet_free.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_off00005ed6.bin
5a62d2fd05a0902707f4191ae3f585d163154a13fcc1ccacce79e9802ccab7fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5068 bytes
font_01_sfnt_off00007012.bin
e0822de6983b029319a63b956ee0fc64583341ee0685969c46f284c27c54d62b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7012 10308 bytes