Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1a79c92242f9f…

MALICIOUS

PDF

48.0 KB Created: 2020-08-06 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0615f3b9d4cfe857a0edd257f4e0756 SHA-1: febe2be99ba6e849fc1de8a9dd4af7e98bfc9294 SHA-256: e9f1a79c92242f9f66d9056d055f7482401c1792859e115073125799a13f08e0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The ML classifier strongly indicates maliciousness. The document body itself is heavily obfuscated and appears to contain the URLs, suggesting a lure to external malicious content.

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=file+%25C4%2591u%25C3%25B4i+pdf+l%25C3%25A0+g%25C3%25AC
    • http://files.marywillock.net/uploads/1/3/1/8/131857421/6faa43c60cee.pdf
    • http://files.ororossodelmonferrato.com/uploads/1/3/1/4/131406182/latodapata.pdf
    • http://files.dallasbrunchclub.com/uploads/1/3/0/7/130776447/tofubovaw-tuvovabunatabep-purigokobezelad-turanamoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/49573300155.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/44848327789.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/simpsons_tapped_out_donut_hack.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/dofematepijizefuwebosi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/tevudufijevot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/12722204982.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/xazujixakidopijadudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4201/files/wedupatelefapizud.pdf
    • https://cdn.shopify.com/s/files/1/0437/8011/2545/files/fexofabezusagufodaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/5982/9149/files/tivif.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/43272131949.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/adobe_photoshop_trial.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/39584896328.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_off000066af.bin
4b819aa3fcf695e3a9fe4839fc87c2738cd02df5a9ba543df7c292cb27cdeebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AF 5268 bytes
font_01_sfnt_off00007858.bin
84b1fae1b9f6aa9a910e1ca2470bf82caf7e104b33a33e113eb49919999498a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10144 bytes
font_02_sfnt_off00009b45.bin
bc7e3f6831be34686de02ce7be2a06b9f1fa2b1a298201cd6e3dc3baf4672bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B45 16376 bytes

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