Malicious PDF — malware analysis report

Static analysis result for SHA-256 b849b79aafd8d2dd…

MALICIOUS

PDF

50.5 KB Created: 2020-07-27 13:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da01cfb84a38f3f2f5a552fab1acb82 SHA-1: 8a055206ad5e44375787dbaa8f7223282b1ed902 SHA-256: b849b79aafd8d2ddefffee3be9a87482af15161faf37dfae2f1c5be933537205
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to external, potentially 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.cc/pify?keyword=alchemist+en+francais+pdf
    • http://files.atomicnature.org/uploads/1/3/1/4/131483097/gururip_gosaker.pdf
    • http://files.jacquelinemadsenart.com/uploads/1/3/0/7/130775544/7fe3dffe9d6d89.pdf
    • http://files.jamesfarris.net/uploads/1/3/1/4/131437249/mujuruzozepa_tafenipon_pavofax.pdf
    • http://files.fortworthdoula.net/uploads/1/3/1/8/131871816/gezowomi.pdf
    • http://files.koasportsleague.com/uploads/1/3/1/3/131397938/pezuna.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/xikavup.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2646/files/85978458735.pdf
    • https://cdn.shopify.com/s/files/1/0432/3970/2687/files/94110187928.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/26915524585.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/firimurunigodovubowavixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8852/files/samotal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/32713819748.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/kubeloperidodod.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/miruju.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7591/files/79195835767.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/66286355667.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/wifafipakokovavir.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_off000089d0.bin
806b5c06b0ac73cccb6de3067e502e485cc783d258132fee5618222d7c5581bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D0 5060 bytes
font_01_sfnt_off00009aca.bin
5976f31f125153261e8ac89110807a00478d6c08bd8968602f895cacadb4b459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACA 9908 bytes

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