Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8315f8800665b7…

MALICIOUS

PDF

48.5 KB Created: 2020-08-31 02:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb92a2e48e3300c4c280cfa39cc2318 SHA-1: a341b81e69e0c309f121153f4983327e8eedb545 SHA-256: cf8315f8800665b7222e18b7033e2d13a4cc2a9c51c5ad9df21e06e210dac08f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=ingilizce+temel+gramer+bilgileri+pdf, which is also flagged as a malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify domains, suggests an attempt at SEO poisoning or a link farm to distribute 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.ru/wix?keyword=ingilizce+temel+gramer+bilgileri+pdf
    • https://static.usrfiles.com/ugd/f63f29_13a9d1d837584c4daa5d2cdb87fb0904.pdf
    • https://static.usrfiles.com/ugd/a01749_c5963e2bbaf548c297c82ff64903c46d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4cf732d47c449cf83f8a5298c1d6b1a.pdf
    • https://static.usrfiles.com/ugd/4d935e_9f84dc81e66b492bab64a387ff36464c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f3a53aed817421298ef206ac3598351.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/96031069721.pdf
    • https://cdn.shopify.com/s/files/1/0462/6805/5714/files/nabikopodumekukurelib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/american_beauty_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/geographic_tongue_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/2179/4460/files/velajip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/12224467218.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/enable_location_services.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/vuvazimokegimawes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/cyanogenmod_11_4._4_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1679/files/29687783214.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/67723686309.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/12898331690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006196.bin
e76d3dccdadb78a09197a427f92635efc3e25b6837af5e70c3110855dbfae025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 5104 bytes
font_01_sfnt_off000072c9.bin
9bb9244264d17a68fad00aa57465243cba375a8215a787cd97c70b92145c7641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 17132 bytes
font_02_sfnt_off0000a47c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA47C 4324 bytes

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