Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a3fc5a380fd74f…

MALICIOUS

PDF

59.0 KB Created: 2020-08-29 22:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afe674f5841b93c25fa87056ac9593f SHA-1: 9f7d1d468bbd19f6a476431cb60db830ea2f8981 SHA-256: e4a3fc5a380fd74fb02c54c72d5b02d8ab4905504bab421177ad02bdfce3d1fc
152 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/wix?keyword=download+psiphon+3+new+version+for+computer'. This URL is likely part of a social engineering campaign to trick users into downloading software. The document body also contains this URL and numerous other links, many of which are benign, but the presence of the malicious redirector is the primary indicator of compromise. 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/wix?keyword=download+psiphon+3+new+version+for+computer
    • https://static.usrfiles.com/ugd/b8c837_a3e060cd61624e13923302f728930d53.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d34c880e3b14f44b39ab8d267b25c3f.pdf
    • https://static.usrfiles.com/ugd/cf14a4_ba154d6e81654d888427efb31cdd7c77.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c45879901e34e7a9171cf37e6f36f16.pdf
    • https://cdn.shopify.com/s/files/1/0455/5584/3237/files/adn_polimerasa_1_2_y_3.pdf
    • https://cdn.shopify.com/s/files/1/0465/9023/0693/files/fedex_straight_bill_of_lading.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/87871665891.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/hcnr201_000e_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/34285490288.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/barron_s_ap_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0437/8610/9086/files/vacation_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000c4cb.bin
53a916b8375666d51fe2e31a9dea18361d814a6e217fb5477a3c3054fd5dfb80		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC4CB 17276 bytes
font_00_sfnt_off00006f7b.bin
82c84ae5d629ebb1785ea8f4b17c1317561d86a260b8a93bb8c0017d3037a5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7B 2984 bytes
font_01_sfnt_off00007a2a.bin
7d3ba95095c1f2596e3661e7a51794be5cc30bdf90b1ba68311676d7b64b9041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2A 5708 bytes
font_02_sfnt_off00008d75.bin
593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D75 6640 bytes
font_03_sfnt_off00009f13.bin
2c312c15c9976a6e2ca7a05531c338357174e9d1859082375772130ded97be7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F13 11128 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.