Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9759ce1bf5f858…

MALICIOUS

PDF

70.7 KB Created: 2020-08-04 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcdac0d01a5bc3518f132b82e7212231 SHA-1: cd0ff0ff576457859ba97065e89abeb3927ffa93 SHA-256: ea9759ce1bf5f8581c2736f5186c8c183f10741f47821820d93f61ee92c9944e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the redirector. This suggests the primary purpose is to trick users into visiting a malicious site via a seemingly legitimate PDF link. No scripts were extracted, and the PDF structure itself is the delivery mechanism.

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.cc/pify?keyword=agrarian+reform+history+in+the+philippines+pdf
    • http://files.allprorepairnc.com/uploads/1/3/0/7/130775823/nejakeromelamop_vitojone.pdf
    • http://files.pulse-uca.org/uploads/1/3/0/7/130776542/3675760.pdf
    • http://files.shopgirlcookies.com/uploads/1/3/1/6/131606186/62d7b18dcea.pdf
    • http://files.shopgirlcookies.com/uploads/1/3/1/6/131606186/62d7
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/96985973942.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/68266938653.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/kojodida.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/puguz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/sagaruzogaxetanavedewine.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/tiresitoxulivoborodewidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/napeji.pdf
    • https://cdn.shopify.com/s/files/1/0439/2864/9896/files/kivar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/sylvia_s_mader_biology_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6437/files/26039860634.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/50071584238.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/35908346328.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/zenipolewisuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a8.bin
5621c4442e9db022871048ee9435f7fb2b0d5f255dbfce3948a998f08cae366c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 5544 bytes
font_01_sfnt_off0000e96c.bin
83885902070a97759eeb50920f65d8ca8bc57d768e532ecf62288a8599b1e70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 10764 bytes

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