Malicious PDF — malware analysis report

Static analysis result for SHA-256 81da6045a0981334…

MALICIOUS

PDF

47.7 KB Created: 2020-08-09 04:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3ec4538def113ce7f68b0844e6fa84 SHA-1: 0f8a040bf8ba7b5be85db15f6390c61bcd16b127 SHA-256: 81da6045a09813345609827d7ab8df8378134be29ad44725a92924aa75493cd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to drive traffic to malicious sites.

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=afinitas+adalah+pdf
    • http://files.lowellhighextra.net/uploads/1/3/1/3/131398129/9606604.pdf
    • http://files.b-cozyhomedecor.com/uploads/1/3/0/9/130969151/caacd203adb3920.pdf
    • http://files.ssvcc.com/uploads/1/3/1/4/131406715/femow.pdf
    • http://files.buildingblocksnorfolkva.com/uploads/1/3/2/6/132695445/a40b6.pdf
    • http://files.cameronvocalmusic.com/uploads/1/3/0/7/130740118/9994646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/vawiwabuxixapogewapuvuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/xesuvoguzuwaxiso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7524/7003/files/ubuntu_18._04_install_freezes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bivunamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/gobudox.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/rollercoaster_tycoon_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/mewitene.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/86338392178.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/anatomy_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/zimafoberiwe.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/methods_of_preparation_of_alkanes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/astm_e84_class_a.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/xumamuboniretow.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db7.bin
a9d52c8114e9d8dbe28849f55a847650c6cb1000da0ed8132d1b08931812febf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB7 4580 bytes
font_01_sfnt_off00006d25.bin
aa81029df24be2642836e470baf5596e60e3961b8aabd55f2698d1c0df6a8d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D25 9588 bytes
font_02_sfnt_off00008e2f.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2F 16144 bytes
font_03_sfnt_off0000a330.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA330 4324 bytes

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