Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e742bcad486d4f…

MALICIOUS

PDF

62.3 KB Created: 2020-07-31 00:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32e62e229be2f016afb5ae9fa3d1f4bd SHA-1: 71d9cbfec457c7d10150967b321df6c5ddf289a1 SHA-256: f5e742bcad486d4fee33d660ba81d20133cb5568db836f7717f0c3b9ed75175f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'lateral epicondylitis protocol pdf'. The primary malicious IOC is the redirector URL, which likely leads to further 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=lateral+epicondylitis+protocol+pdf
    • http://files.heartofillinoisorff.org/uploads/1/3/1/0/131070982/7a536d.pdf
    • http://files.bulletproofcannonball.com/uploads/1/3/1/8/131856398/dutagijujadif_lavuxemivorepug_nibasabepuwuxal_befugavunevop.pdf
    • http://files.mywhiteprivilege.org/uploads/1/3/0/9/130969731/6c005b62ba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6867/files/71686559601.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/83196338809.pdf
    • https://cdn.shopify.com/s/files/1/0428/7994/2812/files/29022607638.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/satosusowubasarapegigaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/tufunawagupejabaluweletif.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/63921781920.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/75354380399.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/70285020737.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/wujazobekibilokojupitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3555/files/59267379743.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/lusuxinezaxasefurexav.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_off00009550.bin
89a8dacd9afadbc80a53c3ea14b459c1fbadcaf29a2f7e50f402cb642710adfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9550 4980 bytes
font_01_sfnt_off0000a64f.bin
4c61bd07d536c5458ddf74e142f8f9e8a5774d1a451c603b476474d0624e6961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA64F 15448 bytes
font_02_sfnt_off0000d694.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16060 bytes

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