Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1a64a993dfcfee…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 07:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cabd00c2cc55a0aa84fb8253845a7fa SHA-1: c18f1821e45c0859df87cc8a753d61217514d08b SHA-256: fe1a64a993dfcfeee427673063c24cafdbef31d67340fda398d5c5d40466cc52
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another noted a large external PDF link farm. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to external 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.ru/pify?keyword=april+2020+current+affairs+pdf+in+tamil
    • http://files.tweedlebeedle.com/uploads/1/3/1/4/131437770/nizotasirameg.pdf
    • http://files.covid19policyhackathon.com/uploads/1/3/1/8/131871778/namolexarani-fetuzez-wifezibex.pdf
    • http://joxal.hofssi.com/uploads/1/3/0/8/130874655/93bac4e4ea79e.pdf
    • http://files.lakeworthanimalclinic.net/uploads/1/3/1/3/131397940/2829451.pdf
    • http://kifazeze.rusticcustomfurniture.com/uploads/1/3/1/4/131453329/xapidibikatusad-wenarakudaposel-fasutaba-dikobef.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/shenkuu_lunar_temple.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/ginasudif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/pdf_page_splitter_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4989/3531/files/bovoxiwekaxikojokonuxonod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/virosifojet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/awg_to_mm_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/82385434407.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/85731909243.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8695/files/boxetoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/vogugovadefepaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/90765185947.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/politica_neoliberal_en_mexico.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a9b.bin
c0cabf04e660267a2336d74d220c86b3c875c77ac73ac36760382c64ecd0c63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9B 5564 bytes
font_01_sfnt_off00007d77.bin
e23b62df359a2469c6c6b8a039ef23129460edf89c080e722bf786a263a2aeca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D77 10076 bytes

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