Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9fc9032e341554…

MALICIOUS

PDF

42.4 KB Created: 2020-07-29 21:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a257096830eb5effe0c501ce492fa37 SHA-1: 37571e8666b111afd15b480e88e57c4c301c128b SHA-256: ab9fc9032e341554b1b3b35d339af2fe76710901ac80851c884f086030a3fd5f
154 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, linking to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains text related to merging PDF files, suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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/pify?keyword=fusionner+2+pdf+adobe+acrobat
    • http://files.wepnerwellnesscenter.com/uploads/1/3/0/7/130776215/wujixawibijen.pdf
    • http://files.napfagroupbenefits.com/uploads/1/3/2/6/132696112/nepujaporogoditomud.pdf
    • http://files.drinkyourcarbs.com/uploads/1/3/0/8/130813841/59951b7a762fd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/69421116149.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/44492774301.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/22010154066.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/17431636430.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/92666839261.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/bozeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/73321249684.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/49417080373.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/90878965197.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/56269026883.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_off00006828.bin
ed63da818adfe87124dd3aae892a1afdcf15718b528d09ef163b3be05c5a3883
pdf-font-stream PDF embedded font (sfnt) at offset 0x6828 5228 bytes
font_01_sfnt_off000079f2.bin
3590deb31b8041f40eacef2464a75aa37ce9d88306c41a68c46fff4a9108af79
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F2 10048 bytes