Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48af63e99c18be…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 01:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 146bd6af6e1b161f7bace434a696436b SHA-1: ac4aed82306c8786e596ed60026cecbf2c56452e SHA-256: dc48af63e99c18beae194c5b0f38dfdedf2bd74af794cea3045349a44f89e952
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.com, further supporting the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the link farm and malicious redirector are sufficient indicators of a malicious campaign.

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=andreas+moritz+pdf+espa%25C3%25B1ol
    • http://files.jameskpolk.net/uploads/1/3/1/1/131163872/672a064456.pdf
    • http://files.icetnepean.org/uploads/1/3/1/3/131378838/toligajudugan-guxevarepuwob.pdf
    • http://files.turkeysmusical.com/uploads/1/3/1/4/131437443/najomibu.pdf
    • http://files.crwlodge.com/uploads/1/3/0/8/130813042/mejomiwe-komejorijulusif.pdf
    • http://saket.joebillinsurance.com/uploads/1/3/0/8/130814124/681433b1a4a.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/84947104297.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/lincoln_weld_pak_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/anemia_y_embarazo_oms.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/hierarchy_in_architecture_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/69499303685.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/zofegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/wuletisufix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/rexerenizegurinonoxuzosu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5764/9566/files/15385316819.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/lowaxorizofupotomumefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/baluta_book_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/tofesadosudipiginimozewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/femuwutenadixugasumidibu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/98920867184.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://cdn.shopify.com/s/files/1/0431/0866/3456/files/tofesad

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007125.bin
182f7e1cecc4b2867c6a4289765504455dcf45bced2547e21c39d49f14e60d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 5440 bytes
font_01_sfnt_off00008352.bin
d0b6f19c4847d89515dae5df19bed8f0a0f4931a39522bb252064d6aa6947797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8352 9992 bytes

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