Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca804e87d0b6c97c…

MALICIOUS

PDF

51.6 KB Created: 2020-08-20 23:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b8e87dc4ff4a9438195f3a8d088c5f SHA-1: db549e5d2248e6668a5055a013100e678142bb82 SHA-256: ca804e87d0b6c97c5cd81fa67ab8524c7cd88329448becf1c0d4324877c37d28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a study guide, aiming to lure users to a harmful site. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the malicious URL strongly indicate a phishing attempt. The PDF_SEO_LINK_FARM heuristic suggests a large number of similar links are being generated, likely for SEO poisoning or link farming to distribute 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.cc/pify?keyword=farewell+to+manzanar+study+guide+pdf
    • http://files.taofineart.com/uploads/1/3/1/3/131380107/7078399.pdf
    • http://files.corneliabush.com/uploads/1/3/0/9/130969080/fagaw.pdf
    • http://datofalap.eastlincolnchurchofchrist.com/uploads/1/3/1/3/131379877/a481f234.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/golden_sun_the_lost_age_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/vamidegu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/vajatakedadugalezeripiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/pibine.pdf
    • https://cdn.shopify.com/s/files/1/0431/9153/3725/files/28929645650.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/barnaby_rudge_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/the_story_of_my_life_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/rojasudufukal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/85878852818.pdf
    • https://cdn.shopify.com/s/files/1/0449/8161/6808/files/38786036349.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/19979014253.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/17787171681.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/70852354730.pdf
    • https://cdn.shopify.com/s/files/1/0435/6574/4287/files/criterios_de_normalidad_y_anormalidad_en_psicopatologia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d72.bin
e2edf08430dae86cc878d7866e057961587cc6a00c11633f9b8cff78c694ed61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D72 5440 bytes
font_01_sfnt_off00008ffb.bin
4440fbdb21688f9d6fce6df1cff41aa6213df6d6ca8fdd5d4f7450f1ced67a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFB 10200 bytes
font_02_sfnt_off0000b2a5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 4324 bytes

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