Malicious PDF — malware analysis report

Static analysis result for SHA-256 681aefda10484b76…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c6a8dff57ca51849b7780a2e0b7ba63 SHA-1: aa9df143dce7f17b064af53ecfc364f37fd879fe SHA-256: 681aefda10484b760c23f46c8b0f95eea40080d6f2e7083ce103a58b965f21d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=alter+memory+5e'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the primary purpose is to lure users to a malicious site.

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=alter+memory+5e
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.pdf
    • https://static.usrfiles.com/ugd/136d07_67cd95b560a14a1389b05a91bef70e75.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a35383d41c1453a8a46c4ddd7051b09.pdf
    • https://cdn.shopify.com/s/files/1/0439/1088/9624/files/boxuwetodazeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/99248628268.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/4057554133.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/2252117226.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/7836432196.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/58430612783.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/77465945397.pdf
    • https://cdn.shopify.com/s/files/1/0432/4012/8671/files/litowijopozezafofutofutow.pdf
    • https://static.usrfiles.com/ugd/c33cdb_fea7c932d2a84cc3b37cb5535c9e3191.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cb6a49217443a2bd38dc59a5914f8a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f44.bin
f72bef7b113a921944120b1939db96b5d52c7475ac7338806cd696e1c4876a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F44 4292 bytes
font_01_sfnt_off00006ddf.bin
ac3e23a80917d4bc64f0012911bc5df4837dddcaed8daa98ecc86106f6f70e08
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 10268 bytes
font_02_sfnt_off000090fd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x90FD 4324 bytes