Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa73068e2bdd0b1…

MALICIOUS

PDF

45.5 KB Created: 2020-08-14 07:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a565c980df1ad2445a05906014affdc SHA-1: dba4bc102ba1b242badefdd249c851298f9c5503 SHA-256: 5aa73068e2bdd0b1cd51f901e4ea9aab08daccbcfbc5212966b8975168b16f68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute potentially malicious content, including a link to a cracked software PDF. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=corporate%20governance%20in%20business%20ethics%20pdf
    • http://files.jackriverschool.ca/uploads/1/3/1/4/131437671/9419734.pdf
    • http://files.aztech2o.com/uploads/1/3/0/7/130740298/13888e10.pdf
    • http://kugati.mypaklaw.com/uploads/1/3/1/4/131453145/josedulixowe_gifaxumew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/photoshop_cs3_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/sybcom_advertising_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7823/8886/files/autocad_tutorials_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/tovafazaterefiwotegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/mudarajudoguxirute.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/22876473824.pdf
    • https://cdn.shopify.com/s/files/1/0436/0873/5907/files/surah_al_mulk_dan_artinya.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/windows_8._1_single_language_product_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/xotorojazisem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/retinosis_pigmentaria_scielo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/27658013166.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/robaxivujezelapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/difemonagisafitegegaloma.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_off00006493.bin
9c91088bdeda3b05b778fcb4bfffe75b826454f9777d8907fdc1ab47dd0da131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 5492 bytes
font_01_sfnt_off00007738.bin
4ee7111c5da5fe66141e35d713216c3d690a96ad856e974c366e9e711ba8760d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7738 10204 bytes
font_02_sfnt_off00009a0f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0F 4324 bytes

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