Malicious PDF — malware analysis report

Static analysis result for SHA-256 338fb4d964f8ef10…

MALICIOUS

PDF

50.4 KB Created: 2020-08-04 10:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a18875ef8ec0234ad4a3d3439af8cb SHA-1: 8049169709dc5ad23b00dd9f119d7f4f2cc38aef SHA-256: 338fb4d964f8ef10695f762f9605f959798ee77127db1da3bbe83cbb4a95ac75
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. This suggests a link farm used for SEO poisoning or to host malicious content. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be redirecting users to malicious infrastructure via embedded links.

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=a+muralha+da+china+kafka+pdf
    • http://files.theshadowagency.com/uploads/1/3/0/8/130874641/xujafudovogexibomisi.pdf
    • http://files.deltonamiddleffa.com/uploads/1/3/1/8/131856619/ponabirapafuwodarek.pdf
    • http://files.lisajmartin.com/uploads/1/3/1/1/131163712/4314795.pdf
    • http://files.verticallyconnected.com/uploads/1/3/0/7/130776351/ximis-junimif.pdf
    • http://files.dmavro.com/uploads/1/3/0/9/130969699/2536316.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/salitidim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/4612803705.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/jovusofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/63104674454.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/awareness_of_environmental_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/convotherm_combi_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/48360036959.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/5321525830.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/71667230489.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/what_country_code_is_33.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/bukeliwixujodolifosof.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8021/files/lutusojinosoziguwofer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/10638699669.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_off00007c09.bin
b648d1a607dfcf5af20d5324a2cd5208175b161677ccdaa5bd5293d7c542ea31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C09 5272 bytes
font_01_sfnt_off00008dc5.bin
eb28a6242e5157b70017f85a44ce1d627a652885ad75104b5167abacdaca59fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC5 15160 bytes

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