Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b6131f558f0f1e…

MALICIOUS

PDF

40.8 KB Created: 2020-07-24 02:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd8e97b1ba78d39874b6cbc0e77d5c4 SHA-1: 6d8bed5755c85f4fa67a86d876b321cd5b55abcf SHA-256: 63b6131f558f0f1ea7e4fd87010ace8c51dfc49cd33ec55da005983374d964f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'birthday wishes images' which may serve as a lure.

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.com/pify?keyword=birthday+wishes+images++with+name
    • http://files.craftgalleryohio.com/uploads/1/3/1/0/131069819/ee91e29ded.pdf
    • http://files.karenglinski.com/uploads/1/3/1/3/131384442/komixevepidas.pdf
    • http://files.maghknog.com/uploads/1/3/0/7/130775520/8349013.pdf
    • http://files.villalaurus-enluberon.net/uploads/1/3/0/8/130873810/lewusob-fafomovetodi-pilazun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/resepiwojekowirit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/fesiguvabinawasudilawiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/37064494843.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/wufijuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/51889848861.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/wimewenadasolipodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/2562154605.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36103472339.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/33738006429.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/befefe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063be.bin
bfc5737070a13262b8e737e9b62906449ccac5e15ae8de858c6aca95011f8704
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 5128 bytes
font_01_sfnt_off0000751a.bin
352caaef432225febc1f42ef12b1b697df1af9c670d3db924cfdfa77e461e5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 9548 bytes