Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5f9ca8ec78dc1c…

MALICIOUS

PDF

47.7 KB Created: 2020-08-08 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4294d3cb7adda38bd6abf5d09f21536 SHA-1: c32bce79b0f1793102ab6bb126547207ae8392fa SHA-256: ee5f9ca8ec78dc1c943afa6215d240b96b28bf54891009ca8e85cbf4ccb1c9ea
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to a redirector service, specifically 'ttraff.ru', which is associated with malicious activity. Another heuristic noted a large number of external PDF links, suggesting an attempt at SEO poisoning or a link farm to distribute malicious content. The document body itself is heavily obfuscated but contains the target URL, indicating the primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=vector+canoe+tutorial+pdf
    • http://gagena.pttminc.com/uploads/1/3/1/4/131453194/9116009.pdf
    • http://files.ianburtphotography.co.uk/uploads/1/3/1/3/131380063/jetaga_bowenumogidap_ziwamokovujoduf_nuvotese.pdf
    • http://files.buchanans-store.com/uploads/1/3/2/7/132710780/2248441.pdf
    • http://files.sidestreetarts.com/uploads/1/3/0/8/130874339/9fd42646915.pdf
    • http://files.northernstarbounders.com/uploads/1/3/0/8/130813782/gaposubeb_xolemeloxexoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/49188021415.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/radidoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0790/files/xekixen.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/how_to_check_internet_speed_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/bikavuzowaduwemaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/81283089168.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/tijasapadojem.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/canales_de_distribucion_de_bimbo.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/afcat_exam_preparation_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/gemukobutavifowumimaneja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/beating_the_street_download_free.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_off000066d9.bin
4a5cd98893683e3e115961768d621c38c34e3f6e6b3563ce166573e1a6496048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D9 4820 bytes
font_01_sfnt_off0000773f.bin
be4883472fe923ab1f6801307f87d590e7ac58fbd774e9113da4a1cc0ca7908f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 14200 bytes
font_02_sfnt_off0000a3cd.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3CD 4324 bytes

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