Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a86345d66fb262…

MALICIOUS

PDF

44.0 KB Created: 2020-08-05 14:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9beed9df57e7440de09ccb354e2a35 SHA-1: d8cb36bd25f9b4ef638fe4928edcdf6bab8798c4 SHA-256: d0a86345d66fb262c70fb349d4b08dee92d83b77dc25e71ea1709caf9bd0dca6
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector. Additionally, it contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a phishing or redirection attack.

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=assessment+purpose+pdf
    • http://files.brianalyon.com/uploads/1/3/1/0/131070313/mimado.pdf
    • http://files.queensvisionafricanapparel.com/uploads/1/3/2/7/132740327/fb7031a6b29.pdf
    • http://files.starlightmt.com/uploads/1/3/0/7/130775484/kibad.pdf
    • http://files.kellettcommunications.com/uploads/1/3/1/3/131378899/e0ce7dd29.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/16953205101.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/88336999219.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/jibaramuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/nelewikazepejesanarul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/the_library_of_babel_jorge_luis_borges.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/top_selling_books_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/8426/6137/files/54538247480.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/sogodosajevebixorupijan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/963905793.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/90001701344.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/cch_chuyn_file_thnh_hnh_nh.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/78136180588.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/79104870625.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/tojenutux.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_off00006ec2.bin
79e194cadd83deeda0bde8e862596586cd90be5df8de7ac6e1e4c2e7a2f6d4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC2 4936 bytes
font_01_sfnt_off00007f77.bin
c240fcff9b09679be656dce82d26ca8fb23d2fb83ff2a454546a8c76e324526a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F77 10384 bytes

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