Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44c10d5dd67cdf2…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 11:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f0cef1d77803bf3a07f66ad2cdda53 SHA-1: 2dd88a6c9ef2fedf28a6bf75008c0803ea14ef3e SHA-256: d44c10d5dd67cdf2cac85fb96bd8c685043ddad4f7cc0902eca6b75528b219fc
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to the malicious URL's keyword and the redirector URL itself. This suggests the PDF is designed as a link farm to drive traffic to malicious infrastructure.

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=lagu+orkes+amelia+jepara+terbaru
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdf
    • http://lolovi.gr8tjob.com/uploads/1/3/1/4/131407558/xazib.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/interview_questions_and_answers_for_project_managers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0561/files/chemistry_form_4_chapter_1_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/48470733770.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/40846734921.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/pisepado.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/50535018632.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/97323417422.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/lowes_wichita_falls_tx.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/tubutokabutegixunoluf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61238086127.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/jupifuvemovanigavetivujuw.pdf
    • https://cdn.shopify.com/s/files/1/0463/4175/0945/files/report_illegal_online_gambling.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_off000058e1.bin
32edb13801c75a2339750148e1706a096f6be3cfdbad882c943fbd0496636cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E1 3240 bytes
font_01_sfnt_off0000646e.bin
29255c6f2587e090b2c366ac5f663681faba23a5ee666a257f64affae8346835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 5360 bytes
font_02_sfnt_off0000769a.bin
35ece332305d6ecccc01e29d9631de05e5fd26ce437998ea04475b22625a764f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 10080 bytes
font_03_sfnt_off00009964.bin
27a712cfe5fac2d1f2e756af3c580cde9ebd1476b4d8ec02075433e2c29305ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9964 3248 bytes

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