Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe55b52e4b68643…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4e5c949d5bec37a84fbee9e5f46671a SHA-1: 201e3b93c35fad079fe262695056c680ba663d8c SHA-256: 1fe55b52e4b68643e1f60ac1d5b5e89232a31ef0b2e4cfd285adb362073977d1
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that masquerades as a 'civil engineer experience certificate'. This link redirects to 'ttraff.com', which is flagged as a malicious redirector. The document also features a large number of external PDF links, many hosted on 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness.

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/wix?keyword=civil+engineer+experience+certificat
    • https://static.usrfiles.com/ugd/b8c837_82dd0b4838554551a9e9468b73b2aab4.pdf
    • https://static.usrfiles.com/ugd/5438e3_b8ca1c6942b64cb19f5ee961f513c105.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce55f607c6754316ae7eb4bbd0c77753.pdf
    • https://static.usrfiles.com/ugd/c3f88d_4944d1c72bb24cdca6c6746d562d88df.pdf
    • https://static.usrfiles.com/ugd/4dd980_0b7732092b554bf1890bbabeabe58fbb.pdf
    • https://static.usrfiles.com/ugd/3de8a6_fb299f62c57640cda583c8e3162fc914.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1c67659093413da620fc3c1c1b5d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_a427965a6c934825839395d22f6d7510.pdf
    • https://static.usrfiles.com/ugd/b8c837_67660d60ef52465fa2f1dc49f206c923.pdf
    • https://static.usrfiles.com/ugd/de02f3_0c868309a1c2483fa96931f6ef2ba5f5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/embedded_systems_kvkk_prasad.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/70393052882.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/engineering_drawing_book_nd_bhatt.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/what_is_utf-_8.pdf
    • https://cdn.shopify.com/s/files/1/0438/2988/7136/files/tovim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/25757938626.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/gobogenemamumedikijipen.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_off00007c9e.bin
c30c785a1059b72ba3767648271ff6cd28c627acf38c87bdf9baabd69918fb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9E 5040 bytes
font_01_sfnt_off00008de0.bin
0989136546a51f506fcd3d9194c6220fec135dc03f914c5aefc50fff68e9ac83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE0 10272 bytes

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