Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f25cc028230925…

MALICIOUS

PDF

40.8 KB Created: 2020-07-10 01:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a70fddd667050b557ef6c7e5899515 SHA-1: 62086d732e09e25280b74c7e3f89a4820046412b SHA-256: 17f25cc0282309256710e04ef749608802e5876a46f282c16dd9b3512bc5dd38
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, likely for SEO manipulation or to distribute malicious content. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though partially garbled, includes a title about merging PDFs and repeats the malicious redirector URL, suggesting a lure to disguise the malicious intent.

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=como%20unir%20varios%20archivos%20pdf%20en%20uno%20solo%20youtube
    • http://files.meridianbodycare.com/uploads/1/3/1/8/131857193/6976761.pdf
    • http://files.rapidballroom.com/uploads/1/3/2/7/132710690/18f3e10fe.pdf
    • http://files.truvisioncolombia.com/uploads/1/3/1/3/131383959/peretefo_zijudaxisen_vaburerijej.pdf
    • http://files.next-level-impression.com/uploads/1/3/1/4/131408364/2401374.pdf
    • http://files.birdcrazyresort.com/uploads/1/3/2/7/132740501/3e660c.pdf
    • http://files.connectivityusa.net/uploads/1/3/1/6/131606454/8656316.pdf
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdf
    • http://files.yourmagicaldestinations.com/uploads/1/3/1/3/131384250/xabejatimunizukoxu.pdf
    • http://files.ckgwords.com/uploads/1/3/1/1/131164095/tanufuxoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vimenemuzez.files.wordpress.com/2020/07/datom.pdf
    • https://povodijagez.files.wordpress.com/2020/06/5148312207.pdf
    • https://pojupemi.files.wordpress.com/2020/07/98232841145.pdf
    • https://laderafi767971175.files.wordpress.com/2020/06/raliwofusugip.pdf
    • https://jogufufi610947214.files.wordpress.com/2020/07/38333684553.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69696378660.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bac.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAC 6744 bytes
font_01_sfnt_off00005c91.bin
c9c0bd4b19bfc83a16156a461997bf4f1ff9d530c1e6e77f7c80d97f94577533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C91 5604 bytes
font_02_sfnt_off00006f7a.bin
f494ae0dee7df5e62af050c58f611045643333aa9e4e6c285952ae5025acf015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 11168 bytes

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