Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcb086d37cdd73…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 00:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0ed96dc26d42ee71360e0d7942bb34 SHA-1: f63b5b8d6ca2899e6b64de08cafde3d21eecb85d SHA-256: a4dcb086d37cdd731cc483bbb11a972a74cc19ee3d4a44f6d4ccf2e1d6d82956
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is designed to lure users into downloading further malicious content. The document body and embedded link structure suggest a phishing attempt disguised as a legitimate document download. The ML classifier strongly supports the malicious nature of this PDF.

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=understanding+human+communication+13th+edition+pdf
    • https://static.usrfiles.com/ugd/b0b521_45abd4daac9d41549655ef77d04bf549.pdf
    • https://static.usrfiles.com/ugd/0d002d_bc8af9b18fad4b7ab6f62c5953c23a27.pdf
    • https://static.usrfiles.com/ugd/b77b08_1b50b1ca2ca6473f8fd4bfbfe7d57c56.pdf
    • https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_91bf990c28404a6b84c79293ed3236f0.pdf
    • https://static.usrfiles.com/ugd/33c377_d8eb4198c0f64d879e15ee01674d9a77.pdf
    • https://static.usrfiles.com/ugd/e1d12c_bc6f5df4dfdd4073a4b48647a6be37fc.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d9a2a15580cf4e6fad3c03110023e91e.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/41327298414.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/zetamepap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/utorrent_file_location_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/guide_catheter_extension.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/ucsc_eduroam_login.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/blurred_lines_unrated.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/google_camera_android_version_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4339/files/adventureland_movie_in_480p.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/vuzezisolupogifiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8718/3515/files/online_passport_application_form_tanzania.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_off000079b8.bin
184979afe667e065d678329a27ce96cc1f8775d57158e39dd04b3cf672326a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 5744 bytes
font_01_sfnt_off00008d19.bin
e1a5b50f5fd7632576dbd67309bee8f882728bc42640c55f2105dcc18ed60ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D19 10284 bytes

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