Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a524659f2972f5c…

MALICIOUS

PDF

48.1 KB Created: 2020-08-05 05:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51ac6f25b8d934fdab0a1ed7edf0fc8d SHA-1: 4dd965cbb32165495472c4656656f4af52c94cf6 SHA-256: 0a524659f2972f5cf7086f75c81e94a35cae85209cfc715f9659cfc781a536fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic to improve search engine ranking for the malicious content. The ML classifier strongly flagged this PDF as malicious.

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=business+mathematics+notes+for+b.+com+2nd+year+pdf
    • http://mopojap.lessonsofalac.com/uploads/1/3/2/3/132303035/33966.pdf
    • http://files.caeciliesvensson.com/uploads/1/3/1/4/131438079/bafitoju-larajoweko-filuzefagetebam-bapufel.pdf
    • http://files.wvswma.org/uploads/1/3/0/7/130739288/vukogotutifived.pdf
    • http://files.heatherbrittonphotography.com/uploads/1/3/0/7/130775053/pokudo-dukekokoze.pdf
    • http://files.vishmaya.com/uploads/1/3/1/6/131607075/af9878ce5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/58701637724.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/25725477302.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/xakekalisunenoka.pdf
    • https://cdn.shopify.com/s/files/1/0435/5797/8273/files/lavuxufez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/3312834803.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8190/files/lewejitipodifular.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/bedtime_bible_story_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/59340109010.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/zukinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/gibufazifupure.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/5622662358.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/gazidadedawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/vapivize.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/25126016940.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac6.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 6744 bytes
font_01_sfnt_off00007bab.bin
4d4fee3ff52a1db7b01e2776348545738831c83c5f9c394f6fa5536f08c3b36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAB 5816 bytes
font_02_sfnt_off00008f60.bin
7a15e97e552fe791564c67dfa558b804cfa653298dda4ee9ac25f0d875fb619c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F60 10312 bytes

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