Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec833389eac47597…

MALICIOUS

PDF

37.8 KB Created: 2020-08-08 23:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17c1b392d37be15f37bff9f0ba5dc0bd SHA-1: accf1ab3b1cd74d0b712aea31ca3ae0f64598102 SHA-256: ec833389eac47597bb44a6ae3d50e61ab006b24d3024fa45bcbb178b852598cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to lure the user into clicking the link.

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=simple+past+exercises+affirmative+negative+and+interrogative+sentences+pdf
    • http://files.fernandojimenezphoto.com/uploads/1/3/1/3/131382217/3010862.pdf
    • http://files.tailwinddelivery.com/uploads/1/3/2/7/132740743/86e68faf4d.pdf
    • http://pikufamuz.republiek-nederland-18nov2016.com/uploads/1/3/1/3/131381078/5856794.pdf
    • http://files.fvmediacenter.org/uploads/1/3/2/6/132695832/4e2aa303cbbb2e8.pdf
    • http://files.cowcreekranch.org/uploads/1/3/1/4/131407164/tuxifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/92937961674.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/arpav_dolomiti_meteo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/ladikalefuxilejuwavexitox.pdf
    • https://cdn.shopify.com/s/files/1/0437/0238/6856/files/google_music_library.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/43267936332.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/23200042829.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/macro_sociological_theories.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/raxigevigoruwomezala.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/gimuzeximedofo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5071/1705/files/wajiwufajolejulapobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/kilometr_berounka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/17019157554.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_off00005336.bin
cab0b403b50e1078d526e50800335ef761559654e17b8331965d669f325fcf6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5336 5708 bytes
font_01_sfnt_off00006698.bin
6e241d33f50f037e1ff0c81ec42926a7155591115dcb99219b41e1c3affb5628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6698 10224 bytes

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