Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fad6bd3991a88a7…

MALICIOUS

PDF

43.7 KB Created: 2020-09-04 00:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9c467976a0307ec38de5567782a435 SHA-1: 820a2561d709ddd90cac70316c65d134f12dc6f6 SHA-256: 1fad6bd3991a88a71af593228b369592955b616ad404029d2219df07b8f62bf2
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet, aiming to lure users to a potentially harmful site. The ML classifier strongly supports this assessment. The document body, though heavily obfuscated, contains the malicious URL and numerous other PDF links, indicating a link farm designed for SEO poisoning or mass distribution. No scripts were extracted from this sample.

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=making+decisions+worksheet+pdf
    • https://static.usrfiles.com/ugd/8de238_4c18bd74a6e2405f8df7bf8bd81489c0.pdf
    • https://static.usrfiles.com/ugd/c8a981_e54354384d3b4b719fcb199e257fb7f6.pdf
    • https://static.usrfiles.com/ugd/e1c37d_f08b55045ae7489c80d163f73d6ddfd0.pdf
    • https://static.usrfiles.com/ugd/4733ca_3ed500155393452fbcc0333e665a5908.pdf
    • https://static.usrfiles.com/ugd/11baf9_83dd1ccaf660409aba0d157b0b3087bd.pdf
    • https://static.usrfiles.com/ugd/ab059d_a6c936b5d8df46bd93f3021e1e1aa167.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/zewurojejujopap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/64920704094.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/xonisanogutirozebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/zovumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/formas_de_preparar_pescado_catalana.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/zonerupizav.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/85878307089.pdf
    • https://cdn.shopify.com/s/files/1/0439/1324/8923/files/57423474285.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4a.bin
0ff21cf34caaa56c245c6bb19b847c24d20651adf4cd0f41ac81e939117a496c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 5544 bytes
font_01_sfnt_off0000723e.bin
1fc12a375bcc3be3bb541ba0d2e75a9deb76d5cd30a42549199b3ff9798c8b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x723E 1892 bytes
font_02_sfnt_off00007b5e.bin
e2c42ad4a44ba44afd3ba194987b8c5673701d988d77951b14eefb51d654bef4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 11208 bytes