Malicious PDF — malware analysis report

Static analysis result for SHA-256 5846093535139431…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 08:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb3741edc0b3078470ef7bc1351e392 SHA-1: 361dbe0a37626b87ec73cddc3c27ab1e96f87bab SHA-256: 58460935351394313086f2ccc596c2d18670804ca427e9b3a4fd6ac0279d8df5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary heuristic identifying a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=appnana+referral+codes, which is the main indicator of malicious activity. The presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

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=appnana+referral+codes
    • https://static.usrfiles.com/ugd/daca0d_f3b05daa2a724f97b26dd4f08b40ca5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_99c0c71b95044af3ad1db1c9017334a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3d2e4acaca41d0aa66ff906e5fabe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_564deff84aeb4a55a3c3a274bbc38376.pdf
    • https://static.usrfiles.com/ugd/ec0c41_efea144ba1e94381b7caf5f9c74bbfe5.pdf
    • https://static.usrfiles.com/ugd/f0e51d_a3d62413912049f79ff8757580e9dda7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ef5ad615cc40d399cde0dc95359476.pdf
    • https://static.usrfiles.com/ugd/60933b_b409f023102e4c59bd7a7e4dd7b174d0.pdf
    • https://static.usrfiles.com/ugd/72b0e7_d0d76bc352a845e984bb3d226382e00b.pdf
    • https://static.usrfiles.com/ugd/de60da_4a16c8a636f445fe8c8bd06f40d87728.pdf
    • https://static.usrfiles.com/ugd/b8c837_eede28d44e994ed8ba76f8573931113b.pdf
    • https://static.usrfiles.com/ugd/ac51ce_3cd779066ae44798b9f931efa1b5aa47.pdf
    • https://static.usrfiles.com/ugd/89c6ad_625bb00597fa4938b5e673ff40f99cdf.pdf
    • https://static.usrfiles.com/ugd/dd4472_e0dd7d8e8a224cd6a48ebc830949803c.pdf
    • https://static.usrfiles.com/ugd/afe78f_89e973da3eda4e379d85546165d937de.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/75555038187.pdf
    • https://cdn.shopify.com/s/files/1/0462/7362/6274/files/brene_brown_livros.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/flowers_in_the_attic_book_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/rexufexegegimilerabiviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/xilifejo.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/
    • https://static.usrfiles.com/ugd/afe78f_89e973da3eda4e379

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000553d.bin
e963ae5a0a51b7c146f064cc052dfdd006af4f6d2a65c42718579dd4b6af4c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x553D 5140 bytes
font_01_sfnt_off000066b5.bin
441b5d4790f3a0a08a21625072c6895536b6356d0c431f41b1f3c38b5780b138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 11568 bytes
font_02_sfnt_off00008c05.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C05 16092 bytes

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