Malicious PDF — malware analysis report

Static analysis result for SHA-256 76428ed14302a55c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 16:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44776cf126e1d37c33ec9e36e6bfa467 SHA-1: 83f21a5c0aff2121d5cd916433df82d9950a1081 SHA-256: 76428ed14302a55c459f237925c3aba15065868ca95b56b8c8a94c70cc6cfa43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of numerous links, including a large number of generated SEO PDF links, suggests a link farm or a campaign to distribute malicious content. The primary redirector URL is ttraff.com, which is known for malicious activity.

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=antariksham+telugu+movie
    • http://rerut.traceyknapp.com/uploads/1/3/0/7/130776132/6182988.pdf
    • http://nivasasid.maikenmsrd.com/uploads/1/3/1/4/131437423/zagadetegub_kirute_padak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/7603/4198/files/jepagopofemupako.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/mugezupaluvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3709/files/fesaximojixegeputo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/jititediwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0647/files/reducing_fractions_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/9974/1596/files/60166665529.pdf
    • https://cdn.shopify.com/s/files/1/0444/2200/4903/files/70326741598.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/192454759.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/tunafuxaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/nenojajuratukole.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/19939149053.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/fifoku.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/puxowefexun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/vojozokixetatuxilexemor.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ecf.bin
fc38370d4b5abaad8f6567590312a5c40562312006b85ba41ec0b65087231f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECF 5212 bytes
font_01_sfnt_off0000705b.bin
40a98e0c4be097fd9658453fa71339f3cf57e907def8f56cf8ed283f7f3d5505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 10164 bytes
font_02_sfnt_off0000935f.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x935F 16164 bytes

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