Malicious PDF — malware analysis report

Static analysis result for SHA-256 e799307f87f18e1e…

MALICIOUS

PDF

51.3 KB Created: 2020-09-12 00:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e732d2e5b49e5be9f801fb6222e77a47 SHA-1: 7930ccde5e0e261043759bf2600029f107928b77 SHA-256: e799307f87f18e1ee90d20e9ff03bca9bdd0add481add3abb56c9e44d139a2e1
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, specifically 'https://ttraff.me/wix?keyword=explore+shanghai+metro+map+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous external links, including a high number of PDF links, indicates a link farm strategy, likely intended to obscure the malicious destination.

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.me/wix?keyword=explore+shanghai+metro+map+pdf
    • https://static.usrfiles.com/ugd/b4bf80_028e9781ee5f4c339f9244235b2ae42a.pdf
    • https://static.usrfiles.com/ugd/28146e_7d29f3005bf84dd3b24691c1d9e0d819.pdf
    • https://static.usrfiles.com/ugd/19ce5d_75c9cbf03d72442cb63ed4476e56e280.pdf
    • https://static.usrfiles.com/ugd/83b1b3_ce4a547b12ed4f379f3442c5bc57bce9.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/2580654256.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/25787766011.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/medicinal_uses_of_avocado_leaves.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/web_browser_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/giforad.pdf
    • https://cdn.shopify.com/s/files/1/0460/1102/3519/files/76346033824.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/buzitike.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/kedorudukemom.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/89887323427.pdf
    • https://cdn.shopify.com/s/files/1/0435/9274/5117/files/49410044399.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/nimanoremadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/8658731206.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_off00006933.bin
b044f7aea9bd4da09f60dbfa6c607eb09ad2994fa39cfb6d63ff774511ceb15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 5588 bytes
font_01_sfnt_off00007cc2.bin
9fcfe55ec4d1381103fc91432552670ea3e5cbf91721d8ce435363ea9ee7bd87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC2 5480 bytes
font_02_sfnt_off00008f40.bin
bd21f9b6e26ef8e4236ed08b2fd24e4bac5461df3e411e077a931c2b5956d74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F40 15444 bytes

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