Malicious PDF — malware analysis report

Static analysis result for SHA-256 4031ad4bfd7e816e…

MALICIOUS

PDF

63.9 KB Created: 2020-08-10 02:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3bb0d6ef287aaa113cf6812fa0b11b9 SHA-1: 0a3b8349885e79f4a4ba1f07c2ec1b8423503475 SHA-256: 4031ad4bfd7e816e5e197398de55889e4b3e7dba438b842c8d8c8777d37ed0a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/pify?keyword=arabic+numbers+chart+pdf as malicious. The document body, though heavily obfuscated, contains this same URL and appears to be a lure for users searching for 'Arabic numbers chart pdf'. The ML classifier also strongly indicated maliciousness.

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=arabic+numbers+chart+pdf
    • http://files.airbrushingwood.com/uploads/1/3/0/7/130775813/wumekibusexuxam_rujama_lezojuruxaj_mimeziwi.pdf
    • http://files.fundep.org/uploads/1/3/0/9/130969190/jiworefukaxitixasa.pdf
    • http://files.jennifercarrpainting.com/uploads/1/3/1/3/131380005/nekulujasoseb_pogijisetapoj_givimudofil.pdf
    • http://files.daletedder.com/uploads/1/3/1/4/131453365/luwevim_jafasepupavenoj_sekugaz.pdf
    • http://files.tautelab.org/uploads/1/3/0/7/130739212/a8a1a.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/86377863667.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/geniduvaxesozumupufil.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/12602787197.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/depifekewusukatabija.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/sasibevaxow.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/18199915979.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/aprender_coreano_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/1117/6610/files/bluebeam_revu_free_download_crack.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/jinasewitaguzafiten.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/functional_specification_document_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/14901747616.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000881a.bin
435ef90bacae8862f053b4011682faaf384255c8c5c2b5a7ed5eb4f6e5f4840b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 5264 bytes
font_01_sfnt_off000099c5.bin
5aa1d05986d374aa9f6af75dfb8e6b08fe4fb27d6cec3b2b0de80b6cb1056d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C5 10576 bytes
font_02_sfnt_off0000bd08.bin
0128757ccc1044f8281d375987796a1ca8b8f4ae45749472c9e074963ca23027		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 22252 bytes
font_03_sfnt_off0000e401.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 4324 bytes

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