Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e04ca8c381cb77b…

MALICIOUS

PDF

44.2 KB Created: 2020-08-25 19:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a51694756108a12a00d9a99bbe8158ed SHA-1: 64477b824dbb3639ac54442b17d4699be0cf90c9 SHA-256: 1e04ca8c381cb77b90adba1462b19a564e59204d7b0a6cffa54f5b13153021a9
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=bd+result+2019+hsc+with+marksheet`. The document body, though heavily obfuscated, contains text related to academic results, suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bd+result+2019+hsc+with+marksheet
    • http://gatuki.greatfallstrapandskeet.com/uploads/1/3/1/1/131163744/8852303.pdf
    • http://sokonowib.genachastain.com/uploads/1/3/2/7/132710712/zufupezokor.pdf
    • https://cdn.shopify.com/s/files/1/0436/1535/5042/files/3562579395.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/skyrim_filial_bonds_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/pupomum.pdf
    • https://cdn.shopify.com/s/files/1/0462/4069/4432/files/jewozusozugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4952/4127/files/zagemekizezebebapesurexo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/tamil_movies_2019_hd_print.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/xusanaxog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55628578329.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/verifying_trigonometric_identities_worksheet_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0849/0663/files/bujitilavixe.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/metode_ceramah_adalah.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006463.bin
9d7323c273af5594eff0f5ab428c8ec53679600b88f183cb8fcb076e31d764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 5868 bytes
font_01_sfnt_off00007849.bin
143d4c48a663c80d78dcc1fd298c60073fdd61ab2c8f207fd6c235e5e51ca9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7849 13952 bytes

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