Malicious PDF — malware analysis report

Static analysis result for SHA-256 8832227a3418920d…

MALICIOUS

PDF

46.9 KB Created: 2020-08-05 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a6baef1e2d366408fd0902b321227b SHA-1: 5872eb244bfa4233fa9d333a8591634bb899e0f0 SHA-256: 8832227a3418920d45c8fdb81a792216acdfaa79cb263b1b1afe83c60e30c6f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm. One of the primary links, 'https://ttraff.com/wb?keyword=buku%20diplomasi%20indonesia%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious infrastructure, likely for SEO poisoning or to serve 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.com/wb?keyword=buku%20diplomasi%20indonesia%20pdf
    • http://files.annemcallisterart.co.uk/uploads/1/3/1/4/131437980/0d7d9c5b8.pdf
    • http://wadog.chrisnorrisart.com/uploads/1/3/1/6/131636719/gadok-bugerix-dudutomadododov.pdf
    • http://files.rhythmsofawoman.com/uploads/1/3/1/8/131871625/poxexakoluwemamo.pdf
    • http://files.hospitalinfrabiz.com/uploads/1/3/1/4/131453393/8531905.pdf
    • http://files.lightsoutlet.net/uploads/1/3/1/6/131606092/danalub-nowevewunumuz-pigebesibebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/wokopepokipobikapasiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/jujiwudinokipawujomu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/56514312477.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/89944801249.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/telasewebikum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7432/2586/files/43700587788.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/accidental_prime_minister_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/48462480911.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/visudimukepeselinalulaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/21367148888.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/serisepipusukopewozuruzeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/50563140721.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/955417469.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/kujutobijipopek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c1f.bin
bc1dcd68ad5d90f5aa48f9aa08b91b9f00433df2e8a0807785b2dd0dd9efcb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1F 5008 bytes
font_01_sfnt_off00007d0e.bin
81672eebd308162d5b4340395e21b0b3881800d396d7cb7a33220274d6202459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0E 10368 bytes
font_02_sfnt_off0000a036.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA036 4324 bytes

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