Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fb537b6b2fbf02…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 15:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a298d4be317ea6f2ac9088b040ca5a SHA-1: 0ca8e58597e27a7ccdf4971f31453422c0f94552 SHA-256: c3fb537b6b2fbf0259bcdfeb50966a20bd0627bf6d40012369b447c8d550b0c2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=author+s+purpose+worksheet+5+pdf'. This indicates the document's primary purpose is to lure users to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the malicious redirector URL is the highest priority IOC.

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=author+s+purpose+worksheet+5+pdf
    • http://files.cpassociatesandco.com.au/uploads/1/3/1/4/131406104/tomulofakawa-wusopusolixa.pdf
    • http://kufuditam.maronianinsurance.com/uploads/1/3/1/6/131606490/betov-vepalesixuz-patavo-betilet.pdf
    • http://files.goldenraytwinflameearthangel.com/uploads/1/3/1/4/131437881/fafivozejasomat-wixozaxipo-tixovixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/trombone_concerto_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/fukafolezazupimavuvirixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9376/1956/files/play_skool_camera.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/drugs_abbreviation_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/vutesowemaxaxofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/dabadilujemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/65203090181.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/lilafutakigapapuxojom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8340/files/how_to_install_exodus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/93580764728.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_off000062e5.bin
88cf02879d3e5c4ed84d272ff1fc5155758f18035d479227665a36565251dc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E5 4884 bytes
font_01_sfnt_off000073b7.bin
b21dfedac7323275c028ebeb9f258fcf465ab3d9c10af678dee4425cc7305255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B7 11108 bytes
font_02_sfnt_off0000985a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985A 4324 bytes

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