Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea745675b66bf8d9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 13:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25189d6d1c449e88cb9292cbe11500ed SHA-1: cdee5f48ee8363d557425987942b5e62c01be5e0 SHA-256: ea745675b66bf8d93f08f983dfc4257ce08424f4f40a43a32d5a773d20e567e5
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 ttraff.com, which is used to lure users to a malicious payload. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'exercicios resolvidos capacitores pdf'. The presence of numerous embedded links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning technique to distribute the malicious content. No scripts were extracted from this sample.

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=exercicios+resolvidos+capacitores+pdf
    • http://files.salemtownneighbors.org/uploads/1/3/1/1/131164273/5513270.pdf
    • http://files.northjeffersonrepublicanclub.com/uploads/1/3/2/6/132695586/eb65c186453233.pdf
    • http://files.mkrgenealogy.com/uploads/1/3/1/4/131437711/finopero_mefitelakeb_nujidikewi.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://mavomu.assemblyofgodwindom.com/uploads/1/3/1/3/131383791/501bc9da69d97a8.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/zijewelisaruj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/bopuvaxumega.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/42454079958.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/morikozilotalagagovo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/37612843264.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/23747249824.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/lovaliloresuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/30714300576.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/xexesutin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/defajabewepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/61440788105.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/43841762126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.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_off000065a4.bin
4d969eb2d5d1dfa481de8e8652c07526e784cb13ac2c348f6edbabfd7a56deaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A4 5236 bytes
font_01_sfnt_off00007790.bin
b9d34267985576df817b89df113e4a9cc95c2a4f5b1032d6118f641e386cdd91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 12172 bytes

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