Malicious PDF — malware analysis report

Static analysis result for SHA-256 8719dc08f1d1cfdf…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 18:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1714508e3b0ea14068290cb0d9245750 SHA-1: 41d8ef70c04cee1c339c8bafdffd8b80975c00f6 SHA-256: 8719dc08f1d1cfdfafc15f3e5e2cc58869a4dc908758398d1b5e852b879672da
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by multiple critical heuristics, including a malicious redirector link and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL, https://ttraff.cc/pify?keyword=%25C4%258De%25C5%25A1tina+pro+%25C5%25BEivot+pdf, is likely used to redirect users to a malicious payload. The document body contains garbled text and embedded URLs, further supporting the malicious intent.

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=%25C4%258De%25C5%25A1tina+pro+%25C5%25BEivot+pdf
    • http://files.reclaimyourstrengthpt.com/uploads/1/3/2/6/132682070/2042848.pdf
    • http://files.mdfoodtrucks.com/uploads/1/3/1/8/131857024/c5fa71ed0.pdf
    • http://files.ethansshop.com/uploads/1/3/1/1/131164153/nodinorod.pdf
    • http://files.mariaohaver.com/uploads/1/3/0/7/130738876/xabegalavemupedoxofo.pdf
    • http://files.karenrobinsondance.net/uploads/1/3/0/7/130775606/5020933dce5625e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/fewigizivipokawiluk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/15889435960.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/plant_systematics_and_evolution.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9839/files/jakikotopowuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/74149914149.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/asme_section_ix_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/numiwufozilumupajuzore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/85458196675.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/92937122428.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/tuxizogizekolomazifutexam.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/plastic_bottle_manufacturing_process_flow_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/7305/2575/files/sixobegufozipesisowiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/95498999679.pdf
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/charmaine_harris_swarthe.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_off000067b9.bin
2a0104684a36af914093258f0ef8b4307098cd312a4a925fb2c8102feb31cc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 5228 bytes
font_01_sfnt_off0000793e.bin
fef592c66f55b32388f17455351817a6175a932d0c5d8c790d70136e1a61ca77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 13008 bytes

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