Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6156233a831f00…

MALICIOUS

PDF

51.1 KB Created: 2020-08-07 14:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed428967729d9ab54a2a50c1981f7822 SHA-1: 91a1773ffbbd1c691714188463c04fd88aece674 SHA-256: bd6156233a831f00fec683b3cc0662091e79a29c5d0db21c576aee2b653839ed
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=catalogo+andrea+escolar+2020+pdf'. The document body also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=catalogo+andrea+escolar+2020+pdf
    • http://files.candlewoodlakeestates.org/uploads/1/3/0/9/130969926/voboworeti_tovugaxotig_setawupejitek.pdf
    • http://files.erinmerryn.net/uploads/1/3/1/3/131383483/4182622.pdf
    • http://rosiju.tyanawoodsphotography.com/uploads/1/3/1/3/131380485/bumolovakamupag_levekez.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/mabokabobuzubiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/mijoketutazezagew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/zidifisogazon.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/valegopiwodojumikebafas.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/95394580584.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/ratavuzubiwubejawo.pdf
    • https://cdn.shopify.com/s/files/1/0448/4520/3618/files/calentador_solar_casero_proyecto.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/84831919754.pdf
    • https://cdn.shopify.com/s/files/1/0429/6438/5951/files/57617387946.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/jogigizazuzuxafusomek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/wumenuza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce9.bin
73a55503828ab604cb898114cac3c1a43f3bbcd282655232aa327da9b824513c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE9 5504 bytes
font_01_sfnt_off00006fa5.bin
7ddf9ef5ca27ccbd28bd29df8ae8dea54120ca4f5b6f637bf81e5a66f820fcff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA5 5544 bytes
font_02_sfnt_off0000835e.bin
7339609586e17c5c3c68f511176d55e832b61c96fc49f6993e9e547a389e00cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x835E 11480 bytes
font_03_sfnt_off0000a8c1.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C1 16060 bytes

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