Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba996b76b30a428…

MALICIOUS

PDF

46.2 KB Created: 2020-07-10 19:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eec569aefb2d6bb04c07a54895304a4 SHA-1: bbfae2922270f5333b8999ca92f28abbd3a65053 SHA-256: aba996b76b30a428ef182f82c7125ae4f0e2094e3af99b0873c04f4e75b61f96
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious redirector and link farm, as indicated by the critical heuristic firings. It contains a large number of embedded URLs, including a primary redirector at `https://ttraff.cc/wb?keyword=dialogo%20venditore%20di%20almanacchi%20pdf`. The document body text, though partially obfuscated, also contains this URL and references 'Dialogo venditore di almanacchi pdf', suggesting a lure. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=dialogo%20venditore%20di%20almanacchi%20pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://files.sacramento-tga.com/uploads/1/3/1/3/131383383/6630f2ffd9ce495.pdf
    • http://files.newlifefrostburg.com/uploads/1/3/0/9/130968937/3686568.pdf
    • http://files.olmmparish.org/uploads/1/3/2/6/132681767/9168426.pdf
    • http://files.projectufo.org/uploads/1/3/0/7/130739381/4877757.pdf
    • http://files.vineleavespress.com/uploads/1/3/1/4/131408913/mesisitudugarefikun.pdf
    • http://files.townsquareplayers.org/uploads/1/3/1/4/131407424/48220b6dd.pdf
    • http://files.caninearthritisandjoint.com/uploads/1/3/0/8/130813409/9348804.pdf
    • http://files.thomastownns.com/uploads/1/3/0/7/130740232/3df875.pdf
    • https://jesudutidak.files.wordpress.com/2020/06/rakunekedenadowufe.pdf
    • https://madujopatole.files.wordpress.com/2020/07/75300376153.pdf
    • https://nafevulaxa.files.wordpress.com/2020/06/tivezadozujoze.pdf
    • https://julesejaw.files.wordpress.com/2020/06/37653463905.pdf
    • https://vabajug.files.wordpress.com/2020/07/48188379000.pdf
    • https://fuwejavogo.files.wordpress.com/2020/07/nimerikulopuduvij.pdf
    • https://kiligirili.files.wordpress.com/2020/06/66365604689.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/73115541349.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.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_off000076cf.bin
6ac6daa3f2ffecc39c8cd1748af12cae63026af219f0c88cbb5af74b47f88ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CF 5236 bytes
font_01_sfnt_off00008879.bin
43ed5f226a1cdadaa557c1d0c4b48d229a12b782589e159ac7be5ebbfcac2ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8879 10276 bytes

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