Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b1009cb81682db…

MALICIOUS

PDF

37.7 KB Created: 2020-08-12 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ad707af9a16dfc10be90179fdd90ac SHA-1: f921d0f97d42bef1bb7983025e8ac1717690d861 SHA-256: b5b1009cb81682db81e677b6b95075871c36f14448bfa32684ad296b813396cf
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. This is indicative of a link farm designed to improve search engine rankings. One of the primary links, 'https://ttraff.ru/pify?keyword=ribbons+down+my+back+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to lure the user to this malicious redirector.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=ribbons+down+my+back+pdf
    • http://files.itccnc.com/uploads/1/3/1/8/131856706/5392367.pdf
    • http://mokaseza.kwikkoldrefrig.com/uploads/1/3/1/0/131071164/dfec07103.pdf
    • http://voloxumi.qimingblog.com/uploads/1/3/1/1/131163635/6899609.pdf
    • https://cdn.shopify.com/s/files/1/0438/0763/7661/files/astm_a36_specification.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/57131601946.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/72451222759.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/40283735690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/ziluzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/kidarurokuxirik.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/95302641749.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/dorosiwipujijapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/7940718980.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/25825813860.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_off000055b4.bin
fc3fce9a476c69daf44cb23eedc43a4d7c83833745eb6f037aa44776af431ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B4 5576 bytes
font_01_sfnt_off000068aa.bin
f1ed035dfef053bf8e84029ce066b760e353c9bb2906342cc1ac30467b513dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AA 9836 bytes

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