Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc8ff36c827c662…

MALICIOUS

PDF

43.3 KB Created: 2020-08-21 09:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb88815b22a42ba32657cd261879f6f SHA-1: de951343dd45e09caafc2afd96e3037ea39a7874 SHA-256: 9bc8ff36c827c66260f41eebd62ab49d79407387026752715891edc74b78baa8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'https://ttraff.cc/pify?keyword=catawiki+app+android'. This URL is designed to lure users into downloading potentially malicious content by impersonating an app download. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, limiting the analysis of further stages.

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/pify?keyword=catawiki+app+android
    • http://lirif.dunsmuirdeerhounds.com/uploads/1/3/2/8/132814930/7ff681b.pdf
    • http://nowaxoraz.royalenfieldmotorcycles.net/uploads/1/3/1/4/131408984/6521014.pdf
    • http://zebuzej.shunwen-pen.com/uploads/1/3/1/6/131606343/6a9c82f512.pdf
    • http://mumiz.eastbayspacover.com/uploads/1/3/1/3/131380005/diromikaro.pdf
    • http://files.candycontainer.org/uploads/1/3/0/7/130739814/pezijenasetawujudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/48403783.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/59125119782.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/jexatogituputij.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/vce_to_converter_online_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/jomosupekegaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/32884094395.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/96449949383.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7122/files/fatipixesinanobidugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/94770757220.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/cetoconazol_creme_sobral_bula.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/zijesobofurasiwod.pdf
    • https://cdn.shopify.com/s/files/1/0465/1686/3134/files/netuzajowodavukogosolo.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_off00006d96.bin
c47972ab62b77f6ca1bce4f66a6f0065a035ac2524a23daad11ac448890bcaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 4804 bytes
font_01_sfnt_off00007e06.bin
7366cb35d535e99f13962f6871780cf27cc509208aabe4f0c412eda99e5ece19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 10120 bytes

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