Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4bea632bf9460…

MALICIOUS

PDF

34.8 KB Created: 2020-08-18 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29a5acbe51880d978daed2e963517c3a SHA-1: f8c5d1d43911ad6c221fbb2722790c55e7a131cb SHA-256: a9e4bea632bf946016b695de0bbc5bfc57a061ba06bdbd4845cbaea10839ac16
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious redirector, as indicated by the critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. It contains a large number of embedded links, with the primary malicious URL being https://ttraff.com/pify?keyword=cavaleiros+do+zodiaco+omega+dublado. The PDF_SEO_LINK_FARM heuristic further suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to host a large number of phishing/malware distribution URLs. The ML classifier also strongly flagged this PDF as malicious.

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=cavaleiros+do+zodiaco+omega+dublado
    • http://files.brunovieirademelo.com/uploads/1/3/1/6/131637054/kimuvokanimif-bosixolujopiver-fujimofi-wolotapik.pdf
    • http://xewev.sunnybankanglican.com/uploads/1/3/1/3/131384166/27f90c7a17.pdf
    • http://files.snippityclip.com/uploads/1/3/0/7/130739532/3728654.pdf
    • http://files.betratmo.org/uploads/1/3/1/4/131414134/taxasexis.pdf
    • http://files.dvbpaintings.com/uploads/1/3/0/9/130969192/getafukixene_bisisabufekolut_xelapamirabofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1609/2828/files/transformers_bumblebee_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/boy_baby_names_in_tamil_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/45917827299.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/54458052595.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/24035353947.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/6091145869.pdf
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/nojoletokosazuroberuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/4769779740.pdf
    • https://cdn.shopify.com/s/files/1/0437/1631/3242/files/zipakabefekotajejiga.pdf
    • https://cdn.shopify.com/s/files/1/0439/2009/7448/files/profecia_celestina_filme.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/54111900574.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1675/files/biriyani_720p_video_songs.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_off00004ade.bin
e67029887e67b297601da5f0db7e64dc538215158cf6e6802ab249821bb9c249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADE 5416 bytes
font_01_sfnt_off00005d39.bin
9cf3bcfc6cffffc45d1f9eecac95d4f04aee39ffd59770674eeb4d206f95ec31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D39 9620 bytes

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