Malicious PDF — malware analysis report

Static analysis result for SHA-256 623912fae33c55ba…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 05:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352c94b2dc67450991eefb41fa24cd12 SHA-1: b1fc1257b5df5758d296c44f50cc5b708aae9efb SHA-256: 623912fae33c55ba9ee162af791e328a00d168fb5cfd58a953c7c4f5a5928758
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is used in conjunction with a PDF link farm heuristic, indicating an attempt to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=import+ics+file+to+google+calendar+android', is the primary indicator of malicious intent.

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=import+ics+file+to+google+calendar+android
    • http://files.bowieknifestudios.com/uploads/1/3/0/7/130738993/saguwununukabevoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/5156/3670/files/bengali_movie_durga_puja_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3568/files/evenesence_lithium_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/98962788226.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/10371155533.pdf
    • https://cdn.shopify.com/s/files/1/0436/5467/6645/files/add_anaconda_to_path.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/pitosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/1773584352.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/abdominal_aortic_aneurysm_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/streamline_english_directions_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/how_to_delete_discord_messages_fast.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006312.bin
a62f30590dc0925450838c02cf48ff0307402006041f27e4da223375c9b76e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 5200 bytes
font_01_sfnt_off0000749a.bin
6905cad4a0ad5a6faacc384032a80edb32afdd93507a4a4b8dcf60e87570504c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749A 10316 bytes
font_02_sfnt_off000097ee.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97EE 4324 bytes

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