Malicious PDF — malware analysis report

Static analysis result for SHA-256 422701200c287ad5…

MALICIOUS

PDF

44.8 KB Created: 2020-08-23 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bea879ed2a718f91061358da95fc7ba SHA-1: 5a5f967bb146149cd2c3b1e77eeb1d709eaa0bad SHA-256: 422701200c287ad50e88e9f2b860ff1239df03c02affc96766c849d34aa1d45f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=winrtgen+rainbow+tables, which is flagged as malicious. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute further malicious content.

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=winrtgen+rainbow+tables
    • http://files.gautengseniors.com/uploads/1/3/1/1/131164129/tesufuzovexi_dilexulas_sojaveniwi_muludomokizo.pdf
    • http://files.pulaskibasketball.com/uploads/1/3/0/7/130739169/3bb8cc6bfc5.pdf
    • http://files.westmichiganglsi.org/uploads/1/3/1/1/131163953/tulefibosarokobufewe.pdf
    • http://xegisi.valleyvintagesoap.com/uploads/1/3/0/7/130738970/medavavujekoviden.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/vefakufovodewufowirebisug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/83323283708.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/jodotuxuk.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/choir_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/zijizefiribub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/zixifaliva.pdf
    • https://cdn.shopify.com/s/files/1/0440/4002/8325/files/kaizen_event_charter_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/tetamujibijolekiju.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/dipubudefureruvabevolur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000575a.bin
fe4d534e162261214c31e6e370a2857b0371ff208c8df68a1f548c34d33ec009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575A 3404 bytes
font_01_sfnt_off000063a1.bin
a93a84a945a7b155fe928ad7e21ead86ad83b48f41c6c924fb6e5c273555f88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 4884 bytes
font_02_sfnt_off00007452.bin
78eaca0f9971a4a522f51175f04c67c60f9ee54b9a01000ea7edee5a1d08b91d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 10440 bytes
font_03_sfnt_off0000981a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981A 4324 bytes

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