Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3f05c5a707a742…

MALICIOUS

PDF

59.4 KB Created: 2020-08-31 02:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c650b7fb9363be154aa584c74b476aff SHA-1: d6c8ffcf44faae638e0e3c52238e05a6f74e64b1 SHA-256: bb3f05c5a707a74276005982ca3fa8b15dc6f6f8b821f64e4b1c903c7843dc50
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with the primary one being a potential lure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'distillation column simulation', likely serving as a pretext to encourage clicks on the embedded malicious URL.

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/wix?keyword=distillation+column+simulation+probl
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/english_grammar_present_tense_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/safe_agile_epic_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/wasajijafofiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/10723377476.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/batman_telltale_series_game_android.pdf
    • https://static.usrfiles.com/ugd/2ac701_04648110ab5b4d068c030abde1fce182.pdf
    • https://static.usrfiles.com/ugd/a1fb72_315915015fc54fae920be10dc60461b4.pdf
    • https://static.usrfiles.com/ugd/fef806_b4479895bdf044ff82387545a4389272.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/bhosari_midc_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/armour_of_god_2_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/54504714970.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_off0000ab00.bin
8adc5ce3277b84a6429b1f4f193357a89e5a7c5ad5ff2c21a819bcdaf13fca23
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB00 5220 bytes
font_01_sfnt_off0000bc9a.bin
f60628127f30e63505ce9841d2560fb20bac94a4b4f3361458ed09aad86ec749
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 10588 bytes