Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718f7a4b57f65dd…

MALICIOUS

PDF

48.8 KB Created: 2020-08-10 21:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370ad4d13ff3b7082950685705239504 SHA-1: c84a1e13222b107420d23fd188cf0bd0213f08fc SHA-256: 4718f7a4b57f65ddfc66029f39759f354f0cefc1bf34faddf600af3b3eb6ea2c
152 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`. The document body, though heavily obfuscated, contains text related to 'Ca course details in tamil pdf' and the malicious URL, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. 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=ca+course+details+in+tamil+pdf
    • http://lafedomeg.50magicshows.com/uploads/1/3/0/7/130775164/tuvexizenab.pdf
    • http://files.pinmetalup.com/uploads/1/3/0/9/130969548/7383251.pdf
    • http://files.luciwhite.com/uploads/1/3/1/0/131071295/9924013.pdf
    • http://files.spartanmommyphotos.com/uploads/1/3/2/3/132302871/fivikifonikaxijavuzu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9816/files/52787872632.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/pukadejuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/cutting_edge_advanced_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/31722622801.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/jugabamepasafotezezusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8402105605.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/54228558922.pdf
    • https://cdn.shopify.com/s/files/1/0432/5392/4004/files/complete_pet_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/graduation_announcements_wording.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/loranemogubidebum.pdf
    • https://cdn.shopify.com/s/files/1/0429/4213/6476/files/hssc_advt_11_2020_notification.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/caperucita_roja_a_quien_tienes_miedo_libro.pdf
    • https://cdn.shopify.com/s/files/1/0450/6189/8390/files/believer_s_bible_commentary.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/ruvibinufakojuji.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_off000068ef.bin
0dc3607cd7005e3e5812c3187292b490bd073809662a915a4e11448fa7dbacad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5208 bytes
font_01_sfnt_off00007a85.bin
80570f33dd053fb52fa1988a659d56dcd5fed8de593c8e3e440460893e3a7166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A85 14404 bytes
font_02_sfnt_off0000a7b2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B2 4324 bytes

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