Malicious PDF — malware analysis report

Static analysis result for SHA-256 78041e418784fc28…

MALICIOUS

PDF

41.4 KB Created: 2020-08-16 18:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a235cc3b12ebc123c8bf2fd4222adcb SHA-1: d229029107e67f74bbe4eff11e1fd814e528cfed SHA-256: 78041e418784fc28a93d1ae7d17a1d413f20363f6564a8787c56e730df28c79b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One of the primary links, https://ttraff.cc/pify?keyword=matlab+bilinear+transformation+filter, is identified as a malicious redirector. This suggests the document's purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the heuristic firings strongly indicate malicious intent via link manipulation.

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=matlab+bilinear+transformation+filter
    • http://vopuz.lembahtemir.com/uploads/1/3/0/7/130775350/nowagukeso.pdf
    • http://files.studiogoddess.com/uploads/1/3/0/8/130814432/xivinux_venebigasewuku_rewuzimo.pdf
    • http://ralejil.ocms-mi.org/uploads/1/3/1/4/131438800/welaniguzepuluzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/condor_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/gafezuvalonumaporenizun.pdf
    • https://cdn.shopify.com/s/files/1/0437/6379/4069/files/historia_del_cristianismo_en_espaa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/the_giver_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/speech_writing_samples.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/ned_s_declassified_school_survival_guide_cast.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/fezelelaxovug.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/akb48_senbatsu_sousenkyo_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/55588605760.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26433336276.pdf
    • https://cdn.shopify.com/s/files/1/0430/1363/6259/files/gantt_chart_free_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/xaxivenit.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/air_pollution_in_marathi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061fa.bin
f06b585d9adcdcf6163c8c9735fade3dcadf654f20e5a069f53f588ac54ddf4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5056 bytes
font_01_sfnt_off00007313.bin
f5e87374a6b25856d11f6f097b2d54a806fc142bcb98eca24fde3dd3e9055657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 11060 bytes

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